Sorry to hear about Lucy. Is she an older cat? I hope this was just a one time incident with no other problems.

Strokes are not as common in animals as siezures are.

If it's any consolation let me tell you about my only personal experience with a siezure.

Dusty (now 16 1/2 yrs old) had a siezure about 2 years ago. I was in another room and heard loud pitiful meowing, so I come out to see what's up and the other cats were all nervous and looking by my table. I saw Dusty laying on her side, feet 'paddling' and her whole body shaking mildly. She was unresponsive to me, and had let loose her bowels. Now while I do work at a vet hospital, this is the first time I've ever actually SEEN a siezure happening. While I did have enough sense to note which side she was laying on, and approximate time the siezure lasted, I was in a TOTAL PANIC otherwise. You'd think I would have enough training not to, but I couldn't help myself. Anyways I also took her in the bathroom (mostly because I had just gotten out of the shower and wasn't dressed, and Dusty was laying by a picture window!). I just petted her and kept talking to her. I've been told animals having seizures aren't so much in pain as just plain confused and baffled, and petting or talking to them helps comfort them. Anyways once her siezure was done (less than 2 minutes, although seemed like an eternity) she got up and was a little shaky. I took her to work with me and the vet said she appeared healthy and couldn't find any explanation for her seizure. Although I'm inclined to believe the other cats picking on her stresses her out and could have caused it, but she had been sleeping in her kitty bed prior to the seizure (because I found stool there also). She slept alot that day but was back to normal the next day. Anyways she has not had a seizure since and other than severe osteoarthritis she's healthy otherwise and has not needed any medication for siezures in those 2 years.

It's hard NOT to panic when one of your furkids is not acting normally. Hopefully your Lucy will be just fine, but do get her to the vet for a check up to make sure there is not something that may have caused a siezure. Keep us posted.