Found German Shepard/ Lab (Spicewood Springs)

Found this sweet girl near Bull Creek Park running toward 360.
She looks to be a young, well cared for German Shepard/ Lab mix.
We took her to the vet to scan for a chip, but she has no chip and no tags on her bedazzled pink collar.
My colleague who found her kept her overnight after calling every single shelter in town (all full).
We put up flyers around the park and posted on FB & Reddit.
Unfortunately nobody can keep her while we continue the search and we simply don't know what to do with this sweet girl.
All advice is appreciated.