Clownfish - is she ok?

[FreshWest]

Noticed yesterday that she seems to have her mouth permanently open. Is this normal or a sign of something nasty? She has recently started staying very close to our hammer coral and will chase anybody away including the male clown that we bought her with? Is that relevant/ related do you think?
TIA

I've seen fish with their mouths caught open before and it's usually because they've got something jammed in their mouth- can you see anything?

I don't know much about marine fish I'm afraid, it sounds like it might be some kind of breeding behaviour.

Thanks EauRouge. Doesnt seem to be anything stuck and she was feeding quite happily so maybe breeding behaviour. Will google to see if I find anything.