There are some, but none can quite match up to Lady Mormont.

[He could think of some women among those in the quarantine that would be the match of almost any in House Mormont, but none would match to the little lady. Even Sansa in her way, though he couldn't picture her wielding a sword.]

Arya would be at home here.

[The chance to run about without worrying about "being a lady?" Many opportunities to wield a sword? This place was ideal for her.]

You might not have a sword, but you are fearsome with that umbrella.