I didn't manage to get a pic with her wings open, but this is definitely a red admiral (unless there's any near identical lookalikes in our area).
Found in Barton Creek Greenbelt
Found in Barton Creek Greenbelt
Found in Barton Creek Greenbelt
Southern aspect, steep grassy slope. Full sun. Flowers about 2 per metre. All in first bloom. No seeds yet.
growing among the grasses on my property