You do not battle Gertrude, though she does send you on the quest " ".
You: Is Gertrude here?
Gertrude: HAWWWH? I’m Gertrude.
You: Ah. I see. Is there another Gertrude here?
Gertrude: HAWWWH? I’m the only Gertrude in Windhym.
You: Are you sure? Lyle showed me a picture, and—
Gertrude: Ohhh, Lyle! I miss him so much… how is he!?
You: He’s fine. He wanted you to have this package.
Gertrude: O…M…G… Look what he sent me! A framed picture of himself and some chocolates! Lyle is the coolest guy in the world! Siiiiiiiigggghhhhhhh.
You: He sure is… something.
Gertrude: I feel like I’ve known him forever! We’ve been in a long-distance relationship for almost 3 months! Anyway, I want you to do something nice for him. A friend of mine is trying to get a beautiful crystal from a cave somewhere in the valley for her BF. I want YOU to get it before she does, and give it to Lyle for me.
You: I think I can do that…
Gertrude: It was nice meeting you! I’m going back to FB to write a hot message on Lyle’s wall! Tell him he’s the kyuuutest! Byee!