Yes and no..... If she is straining in the litter box, has a tight belly or seemed to be stressed or pained, I would be worried.
If that's the case, you can add a little canned pumpkin (not pie filling) to her next couple of meals. This will have a gentle laxative effect.
If she STILL doesn't start to have good stools, I would want to see the vet.
You don't want to take any chances with a cat this age.
Let me know if you need more help.