That's a very good sign that she's swimming around, but obviously not out of the woodwork just yet. She might just be lazy - my female doesn't swim nearly as much as the male does. They both spend most of their days huddled up in their preferred corner, making sure to push everything that they don't approve of out of their little spot.
Most places that I've ordered from include heat packs with livestock, and as big a supplier as ORA is I'm surprised that they didn't do so. It is true that clowns are very hardy fish, but 64 is awfully low for fish adapted to warmer waters.
My bonded pair (Snowy and Iced T) likewise have a pretty big size difference. Give them enough time, and they might even spawn in the tank - mine spawn every few months. We're not interested in raising clowns, so the eggs eventually just turn into a community potluck for the tank.
While she is swimming, once in awhile she flops on her side. Sometimes she is pointed up.
We used to breed freshwater fish and give them to our local fish store. That was with my oldest daughter. My youngest is hoping to do that with clownfish. We'll see how it goes.
I too am shocked there wasn't a heat pack. Somebody was off their game yesterday, shipping without a heat pack and only shipping half of the order.

