Winry would appreciate Al playing nice with Merlin. And as long as "Not An Option" is Not A Threat, she'd understand. Maybe. She kinda feels like a third (fourth? fifth?) wheel at this point, since Naoto knows everything going on in the brothers' lives, and she's still being "kept safe". Envy's attack makes it that much worse.

I think Winry needs to deal with some of this herself. Of course, it's bothering her that this happened because of her friendship with the brothers. (So they're right in trying to keep her in the dark - and she couldn't protect herself against the attack. Yeah. She's all twisted up.)

Winry trusts Al. She'll never offer that to Envy, though.