Mother's bf passed, she talked about him like a dog..since he passed she driving me crazy?

I don't know if any of you would consider me a bad daughter. Here is the situation..last week saturday my mother's bf passed..he suffered from caridiac arrest on tuesday 4/19 I believe due to his kidney problem he was going to kidney dialysis. He was in a coma for a week..I went to the hospital everyday with the acception of one day with my mother..and she was so scared to be in her own apartment that either I stayed with her or she stayed with me at my apartment. But now she is totally refusing to go to her apartment and turning down offers from friends to spend time with them..Im trying my best and right now I took out alot of loans and finals are coming up and I seriously don't know if I will pass the semester, no offense but I need some type of space I am only alone when i use the bathroom or have no choice but to sit in my room..I'm praying that she can remain strong..and honestly i don't want it to get to a point in which she lives with me..she is a very argumentative person. I don't see why she is so scared, its not like the man is coming back to life to haunt her..but I will say this she use to talk about the man like a dog to me she would say "he is no fun he's old and im not use to old azz men" another instant a while back it seem like she was using this man to help pay her bills...then she complained about him not helping her clean the house and said he was lying about being sick, but it was obvious in my opinion that he was sick..she kicked him out of the apartment she tracks him down he is back in the apartment. a few weeks ago I call he pick up the phone she screamed at him so bad my own heart jumped "Why your picking up my phone she yelled" he gives her the phone she complaining about him not going to the grocery store for her she feel he was bs(ing) but the man told her that he is sick! If she didn't believe it..the proof was there when he laid in the hospital bed in a coma..we just came from his funeral yesterday and personally I am starting to get somewhat annoyed by her weak attitude, she talk about how his family is the cause of his death through them aggrevating him..but I feel it is Gods will because if that's the case she would contribute towards that being she yelled at the man so damn much! It was obvious he was a good man that was sick at the sametime..everyonce in a blue she say positive things about him..but she complained like she was ungrateful, she yelled about an engagment ring and the man wasn't rich he did help his family alot, and they were planning a family reunion trip, she didn't want to go she wanted him to stay home and save money for her engagement ring.. she knew him for 40yrs but only recently became a couple with him 6mths ago..I felt she expected to much in such a short period of time! Once he went to the hospital suddenly she had such good things to say about him! It's hard for me to feel totally sorry for her when she seems so selfish and mean. I feel sorry that he is gone though and despite that is my mother I felt he should've never start going with her..Can somebody give me feedback..am I being a bad daughter? Is she scared to go into her apartment cause of guilt? What can it be?