How can i ever forgive her?

My mother is an 87 year old and has been very unwell for the last 20 or more years, but recently her illness has taken a turn for the worse especially from a mental point of view.

I always considered myself to be a good loving son and visited frequently and even daily visiting when she was in hospital.

Now just recently she had about 4 grand mal seizures 1 after the other and I believe that there must have been a certain amount of brain damage it took ages before she even recognised me and her confusion was unending.

She used to say things that had never occurued like she was making up a story, Allpart of the seizures and vrain trauma caused i know.

Now my problem is that she lied through her teeth just to get out of hospital and when i showed my concern for her safety and welfare she FLEW AT ME! she tried to hit me and pushed me and all i done was defended myself i blocked her slaps to my head and just put my hands on her shoulders and ok to some extent forcibly pushed her down into her chair.

She then ordered me out of her house and proceded to tell the whole family and anybody else that would listen to her that i had beaten her up, I am a 17 stone 61 1" large boned man and if I had lost my temper in any way physically then it doesnt bear thinking what state she would be in, but not a mark on her!

Not satisfied with the claims of assault she then told everyone that both myself and my wife had stolen money from her and kept pestering her for money.

I will say that on occasions like most good mothers she would give money to me which i often refused but she would get upset and so i accepted in what i thought was good faith with an open heart.

I myself had a heart bypass in 2007 and further chest surgery in the same year for sternal wire removal and have since that time been medically retired.

I dont want to sound like the big hero son but i do have a brother who lives about 5 hours drive away but hardly ever took the time to assist in his responsibilities toward his mother and i USED to do everything i could for her willingly without thought of payment but after all her lies and decietfulness even though i Know she is mentally incapcitated I just cannot bring myself to EVER even consider forgiving her. Even though this is driving me mad.

what would you do?