All her spells have a very high chance of being interrupted.
Strategy
It is advised you keep DoT effects on the Madame when fighting it, in case it charms everyone in range.
DoT should not be used under 5% , just in case it dies unclaimed.
Keep a maximum of 2 - 3 melee on her, as feeding her TP is very counterproductive.
Mages should attempt to stay out of the 20' unit range from her to avoid Frog Chorus.
Hastedstunners are good for fighting her. A BLU with a lot of Haste that spams Head Butt tends to stun a large percentage of the TP moves and can counteract the negative effects of having too many melees on her.
If she casts Graviga after Providence, do not Erase it, so if Frog Chorus occurs, all the Charmed melees will be moving slowly.