My 94 Year Old Mother Has CLL And She Has

My 94 year old mother has CLL and she has been extremely tired and with no big appetite. She recently as of yesterday tried to walk to the bathroom. She needs a walker to do this because she is so unsteady. We are worried she will fall again. We are trying to keep her in her home of 50 years. She we discovered a lump in the back of her right leg which hurts her and she can't put pressure on it. What do you think it could be.
What should we be worried about. Any suggestions. Please and thankful. Carol