She previously had no hides, so give her time to get used to the idea. If you pick her up & then put her back in the cage, you can aim her face to the doorway
of either hide, & most likely as you release her gently, she'll go inside & explore. Remember that her whole cage is new to her, not just the hides, so it's all a bit
confusing & stressful; snakes learn their way around & it may take some time before she learns to feel safe in those "new things". They probably smell funny too,
snakes have a better sense of smell than we do.