If she doesn't offer an alternative, is it a blow off?

Anonymous
I hung out with this girl once. afterward she texted me that it was fun.

A couple weeks later, I texted her to hang out again. She said she was having a family potluck. Then she added that it would have been a perfect day to hang out since the weather was good.

But that was it, she didn't offer an alternative time. In the past, it took me a couple attempts to get her to hang out, but at that time she offered alternative times so I knew she wanted to. But this time she didn't, which sounds like she's blowing me off.
If she doesn't offer an alternative, is it a blow off?
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