Miss Tesman?

How much power does she truly have in the house. She is all for making Tesman happy and evidently Tesman is happy with Hedda. So she keeps her mouth shut for Tesmans sake or is she truly trying to impress Hedda. When Hedda was given a challenge with Thea later on in the play she eventually fell due to the "lack or power". So if that is true than what if Miss Tesman would have opened her mouth and told Hedda to shtu up sometimes. Would her power over Tesman still be the same?