At the very least she'll be prepared, and won't blame OL when she finds out he knew all along. Because she will, because Smiley can tell her and give her a reason to hold it against him - he's known to be manipulative. At the very least leave her a way to emergency comunicate with OL if it gets more dangerous than she can handle. He can port in, grab her, and get her to safety now in a manner of nanoseconds. Bound to help with her paranoia. Tell her it's in case Sheeda attack while she's not in the bunker. She's already wary of them.
If secrecy is important, at least give your purposefully unknowing civilian helper a safety net to prevent all sorts of bad tropes. It's fine if he doesn't help other people, they can take care of themselves. But she's not a fighter, and she almost died recently, so she's vulnerable.
OL is putting her in danger, and not telling her, or keeping her safe, which seems like an unheroic thing to do.