can any one give me please advice....please please please

i have been sponsoring my mum on her visit visa (6 MO.) ad she had done it twice... she quit her job to help me look after my baby and so i can continue working... on her 1st visit visa, when she finished her visa she went back to the philippines with my baby so i can continue working but i almost go crazy because i cant see my baby,,, my mum felt bad but thats the only thing we can do...then she applied again for visit visa,, and now she is here again in UK with my baby,,, im trying my best to brave for the next time they are going back to the philippines...

does anyone know what visa i can get her for her to stay here in uk longer...

please please can anyone please advice me...