Perhaps Harley is learning how to enjoy your company. I believe you said in an earlier post that when she first came to you she preferred to stay in her crate by herself? Maybe the kindness, love, and attention she has finally found with you has set her little Basengi heart a twitter and she's craving your attention but her 'internal clock' isn't set to the 'household clock' yet. Jylly's suggestion about the kong is a great idea.
I know fosters all have unique problems and I have no experience in that area, but I do have time changes in my home 2x's a year (school year-4a.m. wake up, to summer-6:30a.m. and vice versa in the fall) and it takes my dogs about a week to adjust.
Just an aside as food for thought. I also found that my 2 have slight problems adjusting to the equinox changes. Earlier darkness, later darkness, perhaps it's just the changing seasons, or the internal signal to grow or blow a coat, who knows….but it does seem to affect their sleep patterns temporarily as well. Maybe it's just my 2 weirdos:D