Mini I find the fact that your daughter lied about her age to write to a criminal VERY worrying, and I am amazed you are taking it 'so cool' and I am only a couple years older than your daughter. What if she lies about her age on other platforms and meet the wrong kind of people (that she she seem to seek for anyway) and bad stuff happens to her ? have you thought about that or are you also oblivious to that risk ? I don't want to sound patronising at all but your role as a mother is to protect your child, nobody said it was an easy task but it feels like you are in such a complicated situation with your daughter that any reason to avoid a fight is good enough even though that is detrimental to her.
There was many valid arguments that you could have used to avoid this situation without triggering a fight. If that was my daughter I would simply explain that while I could see why she would want to do that and don't have any objection to it I would expect her to follow the rules and age restriction put in place by the website/prison for her sake of course as well as the one of the person she would be writing to. And if she complained (cause every teen would) I would tell her that if she can't be responsible with that kind of thing and I can't trust her to be wise and have common sense then I would rethink her having unlimited access to internet or a phone as those are two things that requires maturity and common sense. Surely your child live in your house ? You are the one paying for her bills and expenses I assume so I am surprised you didn't come up with something ? she lives in your house so surely you can prevent her from giving up YOUR address to strangers ? (let alone murderer)
somebody else also suggested you contact the prison yourself and explain the situation (surely you could do that?)
I am mostly worried because you don't seem to care and seem to have a ''teens will be teen'' attitude to the whole thing, as in if because she is a (difficult) teenager she'll do what she wants no matter what, but isn't it your role to prevent that ? What if tomorrow she wants to prostitute herself or want to grow marijuana in her room and sell it at school or sell cocaine in the streets ? Will you do something then ? Because you haven't (in my opinion) provided any good reason as in to why you can't/ don't want to prevent her ?
I was a very difficult teen and still have a pretty tense relationship with my mom but most of my hatred towards her was due to her lack of rules, I desperately needed them (even though I hated them, like any teenager in the world) but she failed to do that under the excuse that ''teens would be teens and that there was no stopping us'' basically. Well her lack of parenting (and control over me) at an age during which most of us lack common sense and maturity led me in very traumatic situations that I don't wish to see your daughter in. Please for her sake control your teen, take away her phone and cut off internet if that's what it takes but better that than seeing/having terrible things happening to her. You can survive her sulking/ hating you for a while but could you survive/ look at yourself in the mirror if you lose her or if she gets her because of something you could have done but didn't do ?
Sorry if I have been harsh in anyway, but I am genuinely concern about your daughter. Like I said, I am only a couple years older than your daughter, I am basically from the same generation, spent most of my childhood hooked up on internet with parents that had to adjust to new technology and were often out skilled by their children in that area (I think the parental control my mom installed on our computer when I was 8 or 9 lasted a day as it took me barely 10 minutes to hack it and turn it off.
) so I think I can understand your struggles as a parent as well as the danger she is exposing herself to as a teenager and I am not trying to make you look or sound like a bad mother, you are probably trying your best but I couldn't not comment on that, especially after my own bad experiences.
good luck though with your daughter, you do seem to have a lot in your plate and I hope things get better for you Mini.