I think Oksana is constipated

[ancientgirl]

I was cleaning the upstairs litter earlier and Oksana got in. I heard her pee, but she sat there crouched for a good long while. I sort of thought she might have been trying to poop, but nothing happaned. Then she did the same when I came downstairs to clean the bottom boxes. Just now I saw her in the kitchen litter box, just crouching like she wanted to poop but nothing was coming out.

Is butternut squash or pumpkin the thing to give her? Their usual vet is on this week, so I may make an appointment for her on Friday, in case maybe she's got something going on.