I'm glad you approve! Good to meet you.

This would be interesting-- Giles has been known to call on 'summon at your own risk' types when it's time for desperate measures. Possibly he encountered her during some apocalypse crisis situation in the past, so they'd recognize each other as potential allies if it came down to it-- 'this person kept their end of bargain and is as trustworthy as can be expected' type of thing.

Though I'm interested to hear how she'd call in a favor, because that could happen in the future.