UK Visit visa for mother Help needed

Your question is rather confused: do you want your mother to come for a visit (under six months) or to live long-term in the UK?  If she is coming for a visit (and hoping to visit several times more) then what she wants is a multiple-entry visitors' visa. She has a good travel history so they may give her one that is valid for visits during the next two years: they also sometimes give one valid for visits over a ten-year period! Note that this is not a two-year visa, since each visit is for a maximum of 180 days but she can leave and then come back using the same visa.

The other possibility is what they call a Family Reunion visa, which is when she comes to live in the UK and eventually becomes eligible for ILR. From what little you say in your post I don't think she could get this visa.

If she is coming for a visit then spnsorship is not really an important part of the application. She (not you) will apply for a visa and provide evidence that you are paying her expenses and providing accommodation, which means you give her evidence of your finances and your housing situation and she submits this in her visa application. She will still need to provide evidence of her ties to her home country, and the evidence she provided for previous applications (including how she lives financially) is likely to do the job just fine.