Just my thoughts...

She's probably not talked to you for the week because she had someone else to be dependent upon while in the hospital. Now that's coming to an end she needs you again. She's dependent on you.

She needs someone all the time to focus on her. When you're not doing that (and you were focusing totally on her in the beginning because of the incidents that happened and before it all got too much) she's reacting in a manner which is making you feel neglectful or not a good friend. Seems manipulative actually.

I'm not saying she's doing any of this for some horrible or spiteful reason. She'll obviously ill, but until she learns to become stronger and more independent in the way she lives and the way she forms relationships, it'll always be this way.

She is hopefully continuing with regular therapy after she leaves hospital and hopefully that will help her detach a little from you. The decision to separate needs to be a joint decision under the circumstances but all this makes me wonder if her therapist or doctors involved in her care are aware at all of the situation at home with you. If they're not aware, it makes me wonder why not. You'd think that would be something a therapist would think about under the circumstances.

p.s. and you ended up in this place (as you asked) because you didn't realize what was going on in the first place. Not until she took the pills. That was the final straw for her, not the first straw. She'd perhaps been holding on by a thread for so long until it all became too overwhelming for her. It's really sad she didn't look for help long ago before she got to that desperate point in her life again. You stood by her and worried about her and tried to help her. She's clung onto that and that also makes me wonder if she has any other friends in her life besides you...