Sounds like we are very similar. I actually enjoy the process of identifying potential modelling candidates from the teen amateur category and then working on them to encourage them to give modelling a go. Quite often they are complimented and enthusiastic and, if it were only up to the girl, there would be agreement for a developing relationship in which I could push their boundaries gradually to the point where they are doing art-nude or erotic-nude. Sometimes that happens, but the teen category is fraught with jealous boyfriends and protective parents, as you say .... alas!
I am currently working with Natassia who you can see in some see-through panties, orange panties, one-piece swimsuit, etc. She is 20 and the only reason she hasn't done erotic-nude is the boyfriend in the background who is limiting her natural inclination to try nude modelling. I am still hopeful, though.
Another of my models (15 yo Peta) was (like your Lindsay) brought to me on three separate occasions by her mother. On each occasion, mother stayed reading in her car whilst her daughter and I strolled along the riverbank so that I could shoot her. In the shots in which she is wearing a multi-colour bikini you can see her reclining and parting her legs for the camera. The girl was quite comfortable in 'opening-up' for me and she generously allowed me to take many shots of her that were provocative and which sort to feature her slender, fresh, innocent teen body.
I cut a DVD for her and sent it to her, but with the more provocative shots omitted. Although, because of her age, she was always bikini-clad, I think her mother sensed that her daughter was posing for more tantalising and revealing shots so I am confident that this was the reason Peta chose to end her first-time modelling experience. (I have some more shots of her in my DA Stash and can give you links if you'd like to see more of Peta.)
Your Lindsay is certainly a stunning teen and I just love the way she willingly exposed herself to your camera; laying on her back to freely invite your artistic appreciation of her beautiful form.
If you have more shots of her, I'd love to see them and, if you don't mind, I'd love to hear a lot more detail about how you got her to your studio and what happened when you did.
For example: where did you meet her; how did you introduce yourself; what was her initial reaction; when/how did you introduce the idea of nude work to her; what was her reaction; what was mommy's reaction about what she thought to be non-nude work; what sort of shots did she think her daughter was going to be doing; and how did you 'manage' mommy initially; how many shoots did you do with Lindsay; when did you first introduce the nude component; how did Lindsay adapt to her first nude shots; was she amenable to you touching her to direct her into various positions; was she a 'silent type' just doing whatever you wanted, or did both of you discuss poses and positions with Lindsay being quite interactive; did Lindsay seem guilty in any way, especially with mother waiting outside; did she seem a little embarassed after the shoot when she was returning to confront her mother; how did you know Lindsay was a mormon and a virgin (gee, what a fantastic combo .... young, teen, gorgeous, mormon, virgin, mommy nearby ... but with legs spread and her photographer capturing that beautful nude body and stunning pussy ... WOW!). I would love to hear ALL the details about this young girl and everything you did with her.
I also like your attitude in standing right up to mommy's indignation and her attempt to cast you as a villain. I would love to have been there when you got straight back at mommy by telling her that her daughter was 18 and had signed a release .... too late now, mommy. perhaps, as a result of her mormon upbringing, Lindsay wanted to cut loose a little and take a walk on the wild side to unleash her sexuality a little and to feel that, at the age of 18, she had now become a desirable, sensual and sexual young woman who wanted to explore and test her limits.
I have found that mommy's usually don't get too indignant, perhaps because they have a good idea of what their daughter has done and what sort of photos she has posed for, so they respond more often by simply 'withdrawing' their daughter from the situation that they have gotten themselves into and then allowing time to smooth the 'turbulent waters'.
I'd love to hear more from you and I'll have a very close look at your DA galleries. (If you have any additional material, I'd love to see it.)
I think the 'hits' tend to compensate for the 'misses'.
Good luck.