Mum with acute delusional behaviour - help!

A fellow caregiver asked...

My Mother had a fall and fractured her cheek bone on Friday night and was admitted to hospital. By Sunday night she was abusive and hostile to staff and was hallucinating (she thought she saw a small boy at the end of her bed).
I visited her on Monday morning and the staff told me that she had been making extremely negative and hurtful comments about me. She has since accused me of hurting her wrists and causing bruising (which happened on Sunday night as the staff in the hospital had to restrain her when she threw a water jug at the window). She has accused me of making her sleep in the lounge room rather than sleeping in her own bed, and thinks I am in a relationship with a man who has come over to the house and physical restrained her (I am not in a relationship with anybody nor have there been any visitors to the house - I live with my Mum and we are fairly private people). All of these comments are blatantly untrue - I love my Mum to bits and we are best friends. This person I am seeing is not my lovely Mum who is so supportive and I can tell anything to).
My heart is breaking and I feel like I am never going to get her back. It is now Tuesday and the Doctors are telling me that they still don't know what is causing it (maybe an infection - both her CT scans came back clear thank goodness) and that they won't know until tomorrow - maybe. I feel like I am going to have a nervous breakdown from worry and fear for her. It is truly awful to see this person that you love most in the world suffering through this and being so horrible towards you. I don't know what to do ....