My Mom is staying with me due to $ troubles and she is very sedentary. Not only do I think it is bad for her?

but I think it is very inconsiderate that she is not helping with anything $ or chores. I can handle the $ part to some extent. But I always help when I visit people and do not understand how she can be so thoughtless. I do not want to make her feel bad, however I am hurt that she is so inconsiderate. I guess I should not be surprised she has always been this way, its like I am the parent and she is the child. All my life she has not been a good parent , and now I am having to look after her. I think she should stay with my sister since my sister has lived with my mom alot and has stayed with me too. I am the youngest and I am the one who helps eveyone and it is just not fair since they would not help me when I needed help. I tried to tell my sister that its hard for us since we have a full house and she hung up on me. I have always helped my sister yet she seems to not give a hoot about how I am doing . Have you ever had to deal with this type of situation? Advise?