Not knowing what she usually looks like I would say she is building. When are getting ready to lay you will see their spine pushing out like a water baloon turning triangular on top.

Someone mentioned glowing which would be difficult to say unless you knew what she looks like normally. Is she still locking? If so than she is definately still building. Check her twice a day and see if you catch the Ovulation. That is the most important sign you can get. Oh yeah that and when she is curled up on some eggies