What are your plans with all these hydrangea macrophyllas? In Michigan, they will need winter protection to bloom reliably, won't they? You got Blaumiese, Glowing Embers, Forever Pink. I had a GE several years ago... I placed it in a very shady edge in the front of the house and, sigh, it died. Maybe because I failed to water it well in its first hot Texas summer. And its location is one where I rarely go to water anything... that did not help either...
Annabelle is bloom hardier than the macs although it is probably in your "intensive care" ward at the moment.
Give it evenly moist soil as best as you can. Since it is so small, I would give it some liquid seaweed mixed in with the water. If you do not see any "improvements" in 2-3 weeks, you may need to call Michigan again.
What kind of care do you give to those small potted plants typically?