Tanya had been at the colony for months according to her and treated all kinds of injuries. I'm sure she had met all if not the vast majority of the people at the Colony in her time there. She was the only real medical staff they had and I'm sure everyone had come to her for one reason or another. Plus Glenn was the radio guy so he would've known who had gotten hurt in the recon teams and alerted someone that they needed medical help. Saul could've mentioned his Mom was Tanya quicker but the feelings of betrayal by Victor would've probably drowned that out at first.
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