Looks like she could be, she has that almost bloated look to her lower half... have you run her through your fingers to see if you can feel if she has eggs inside her?
I know some females will double clutch even without having a male reintroduced. Two of ours did last year. If you aren't sure, I'd give her a lay box just in case - that way she has it if she needs it, or she just uses it for a moist hide when she sheds. I'd also keep feeding her small meals for as long as she'll eat if she is carrying a second clutch.