Back off, let her see that you can "take a hint." She may later change her mind, she may not, but people like to feel they have control over the pace of a relationship, as in being able to slow it down simply by not responding quickly. When you respond back faster, they get worried things aren't even.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).