Well,

There are a couple of possibilities for this.

Either she is glowing from near ovulation, OR

It is just an environmental change. There are instances where animals just change due to differences in husbandry, being exposed to bacteria, injury (which I'm sure is not the case here), and so forth.

Activities are usually the same in most cases, other than when injured, but you will just have to wait it out until next shed.

There is a good possibility that you may have missed copulations. It has happened to me on several occasions, and got eggs from an animal I wasn't expecting.

Anyway you slice it, GOOD LUCK and NO WORRIES!!