She's showing great Momma signs. Throw in a few toys and a chew, lots of paper towel strips and extra bedding. When I have OCD preggos I throw in a tissue box with paper towel strips, two chews and treats all around the cage. They go crazy and do everything they can to hoard it all into the box. Pregnant females sometimes chase tails due hormone overdrives and a lack of distractions generally.