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The requirements for a family visitors visa as follows :

you are 18 or over;

you intend to visit the UK for no more than 6 months (or 12 months if you will be accompanying an academic visitor);

you intend to leave the UK at the end of your visit;

you have enough money to support and accommodate yourself without working or help from public funds, or you and any dependents will be supported and accommodated by relatives or friends;

you can meet the cost of the return or onward journey; and

you are not in transit to a country outside the 'Common Travel Area' (Ireland, the UK, the Isle of Man and the Channel Islands).

As you will note from the above requirements the main requirements are that your mother has enough funds to accommodate herself and has adequate accommodation.

You should provide with a letter of financial support, your bank details as well as funds she has available in her account if necessary. You should also provide an accommodation letter for her that you will adequately accommodate her during her stay in the uk, this should be accompanied with a house report stating that your property will not become overcrowded if your mother also residents with you during her vacation.

You should also provide evidence of her ties to her home country and provide evidence that she will have reasons to return to her country of residence.

Provided that you have submitted enough evidence regarding the above mentioned, then her application would have a good chance of success.

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