Yes, cats can be given enemas (by the vet) but hopefully you can avoid it. Try giving her a little pumpkin (not the pie filling, the pure kind that comes in a can). Some cats love it, others not so much, but if she'll eat it, it can be quite effective.
I would also recommend canned food or if she will only eat dry, adding water. The more liquid she takes the better.
Lactulose is another medication that I have given to constipated cats in the past, also very effective.
Here's hoping she 'produces' soon so another trip to the vet won't be necessary.