Seizing Dog please please help?

My 11 year old mixed breed had a seizure last night that lasted about a minute. We rushed her to the emergency vet and had bloodwork done and also an xray. The bloodwork showed her sugar to be fine and a little anemic. They couldn't find any internal bleeding. I am watching her gums and they're ok. This morning she seized again for about 30 seconds. They said if she seizes again we'll have to hospitalize her and get a CT test done but I'm not sure I can afford it. Please tell me what might be wrong and what to watch out for? I can't lose her please she's my best friend and family *yes I'm 32*. All the help is appreciated thank you and pray if you do..thank you.