Hi Camiela,
I'm so very sorry to read that your mother's cancer had the chance to spread. Chemo can help keep things at bay, perhaps gain some disease free time but no guarantees. Depending on your mother's general health she could well get more than the 5 months the doctor quoted, we know of folks who respond well and get some quality time. I hope it for you and your family.
I'm moving your post to the 'metastatic bladder cancer' section. Others are going through similar situations and perhaps can lend more support.
All the best to you,
Wendy