She overheard me say “I’m not texting anybody first anymore”… then texted me first that same night. What does this mean?

She heard me say “I’m not texting anybody first anymore”… then texted me first that same night saying “so you’re not gonna text me first lol” what does this mean?
So earlier today at work I was talking (not even to her specifically, just in general) and I said something like “I’m not texting anybody first anymore.”
Later that night, off the clock, she texts me first:
“so you’re not gonna text me first lol”
That’s it.
What do we think this means? Is she just joking around, or is this her way of showing interest / testing the waters? How would you respond?
She overheard me say “I’m not texting anybody first anymore”… then texted me first that same night. What does this mean?
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