Thanks for the reply and the information! I don't disagree about a call setting you apart, but I've found that all the younger (25 and under) girls I've been gaming seem to just abhor a phone call before they're more invested. She's a rapid-fire texter, we haven't spoken via phone yet, and we've only seen one another the night I got her number and our first hangout. So I feel it's wiser to stick to text for the time being.
That being said, in searching around I've found it really seems like I just need a good "ping" text here to open things up again. So I think I'm going to work one of those inside jokes into something more casual, like:
"a coworker's got oxblood docs too…yours are probably more authentic though

"
just to have a little bit of recall within a ping structure, open things up again, and go from there.