How about a pack and play? Maybe you could put it in your kitchen or near you while you are fixing dinner? You could put some toys and things in there for her while you get everything ready. I've done that before for short periods of time. I used a bouncy seat also, I'm not sure if she is ready for that yet though, maybe you could do that later. It has a seat in there and toys, so that might work.
Have you tried some soothing music? That always helped my child and still does. They have a lot of great CD's out there for little ones, so maybe you could try that. I also have a sound machine that works great for my Son. It has the waves, rain, outside-cricket sounds and the white noise. It has helped a lot with naps, bedtimes and other times he is fussy. Even other music like Baby Einstein or you could sing songs to your baby, maybe that might help soothe her. The library has a great selection of CD for kids/infants and videos too.
You might try giving her a little snack after her nap. I don't remember our Son having any major problems with this and at that time either. Maybe she needs more holding, so maybe a sling or the Baby Bjorn type carrier might work also.
If problems continue and get worse, you could always call your pediatrician, maybe there is something else going on that needs attention. ECI (Early Childhood Intervention) is great also if there are significant concerns with development/behavior that kind of thing.
Have you tried Tummy Time? I did that with our Son and put toys down on the floor and got down on the floor with him and he never liked his Tummy much, but they really need to get Tummy Time. He would roll over a lot to his back.
Does your daughter have any type of cuddly toy or special toy that she enjoys? If she does, give her that during her fussy times and while you are fixing dinner.
Hope this helps and it will get better!