The way I read her first text is that she's uncertain, she's vulnerable, and she's guarding herself against being hurt.
The fact that she has sent such a serious text so early on indicates her high level of interest.
It's a test because she wants to see if he will let her go or if he will fight for her.
The OP offers her rapport, kisses her arse slightly and then rather cheekily tries to score an FWB.
I read her next response as being disappointed with his response. "I'm just not at that place right now" makes it sound like he has strengthened her resolve to keep her distance slightly, perhaps because his text didn't convey the same level of seriousness she was feeling.
"I'm a bit of an all or nothing kinda girl" is perhaps the tell-tale statement of the whole thing. That seems to me like her speaking from the heart, where the first text was less honest. I think where she's talking about losing her freedom and "giving him the attention he deserves", she's talking about commitment, and it sounds like that's what she wants.
The fact that she said "you never know" to the FWB thing despite the fact this obviously isn't what she wants suggests to me that she likes the OP a lot and is, in a non-cynical way, trying to keep him around because she wants it to work.
My reading is that she likes the OP a lot and that she doesn't want to get hurt or messed around. Again, the "all or nothing kind of girl" bit suggests to me fairly strongly that she wants commitment. Maybe she's scared of making that commitment and getting in too deep, hence why she's trying to give him an out. But that doesn't mean she doesn't want him to take control and make a relationship happen.
"I agree that you should continue doing your own thing, but I think you should do it with me

"