Put in a bunch of plants, fake or real, so she has some places to hide. She will relax once she has someplace to go. Also, a male is dominate so she will probably leave the food for him to eat as long as she can see him. The cardboard was a good idea, Now plant her side of the cage so she relaxes and she will be fine. Babies at that age play with their colors regardless. When they come out of their shells they are all different colors, they are very pretty. Some are solid green, some have the prettiest stripes and some are dark like your cham. Seems like they just mess around with their color buttons for awhile until life calms down. Don't fret, it won't hurt her. You will have time until her cage arrives, just give her plenty of hiding places.