@DamnBamboo
You're very likely right, knowing her sense of humour she may very well have been joking about it. You can never really tell with her.
I'm not sure if she IS overweight, she's nudging 5'7'' and last time she was weighed she was approximately 160lb so probably a bit overweight but she is very muscular so I genuinely don't know. As for starving herself, I don't know as I only see her eating her evening meal but I wouldn't put it past her and her group of friends are very loyal about not telling anyone what they said to each other. And again, it's almost impossible to tell when she's losing weight because she wears very baggy clothes anyway and she always has a bit of a flabby stomach. She had food poisoning and flu within two months of each other a few years back, she'd lost 30lb and I couldn't see a difference. I only knew because she went for a check up at the doctors.
Asking nicely very rarely works with her, her temper's on a hair trigger and she naturally assumes you're asking something to hurt her. I suppose I haven't really helped that by prying so I've probably only got myself to blame.
I know how often she shaves because she always shaves on a Thursday before going swimming with her friends, she makes a big-ish deal out of it and always leaves her shaving cream on the side and her razor out(in case you're wondering how I know that she says something to the effect of 'no mom, I can't shave my legs tonight because I shave them on Thursdays and it'll make my skin sore', 'mom, you know I always shave on Thursdays and wash my hair on Mondays', 'mom for god's sake I can't wash my hair today, I wash it on Monday and it'll get dried out!' she has my OCD I'm sure) . And I know how many uses per blade because A. I buy the things and B. if I say to her 'change your blades you'll irritate your skin' she says (and I'm afraid I must paraphrase here because I don't remember every version and even if I did there would be too many to put here) 'mom, I've only used it five times. You use a razor blade 10 times minimum before you throw it away. Money doesn't go far these days.)
I don't think it's overbearing to want to look out for my daughter. I probably am paranoid and going about this in completely the wrong manner but I don't know how else to keep an eye on her seeing as she won't talk to any of the family, her friends won't tell me anything unless she says something first and in terms of intelligence and foresight she runs rings around both me and her dad. I've had friends who self harm and I lost my sister to suicide, hopefully you understand that I don't ever want my daughter to be in the position. I know this is a bad way to go about keeping an eye on my daughter but I just have no idea how else to do it.