Ok , you have picked probably the busiest weekend in skiing, Presidents day.Buit the good thing is usually everyplace in the northeast is at 100% open at that time of the year so there is a lot of great places to choose from. In this order I would go for Sugarloaf in Me., Pico in Vt., Stowe in Vt., Bretton Woods in N.H.
Sugarloaf has some very good beginner terrain right at the base area, they have a lift system that spreads out the crowds and you can stay on slope and ski right to your door. It is one of the furthest away places so crowds might be a bit less than other areas but again its Presidents weekend. Their big thing is the ability to spread out the crowds over a large area and have the lift system to accomandate that. After skiing the beginner area around the base try the Whiffle tree quad and the trails off that lift for more green and very easy blue trails. Stay off the Superquad and Spillway chairs.
Pico ( not Killington ) good size mountain, good lift system, crowds will not be heavy due to Killington being right next door.Not on the size of Sugarloaf in terms of acreage and green/blue trails but if you pick Vermont I would go for this one because of the smaller more mello crowd you will find.
Stowe great new facilities over at Spruce, wide open learning terrain, good lift system over there, probably will be crowded. On this site epic and BWPA can give a lot more advice on Stowe, check with them about lessons. Stay over at Spruce don't bother with the Mt Mansfield side.
Bretton Woods, I have not been there in years but I do remember it as very easy going terrain, lots of lifts low crowds for it is one of the furtherst north on Rte 93 most people go to Waterville Valley, Loon or Cannon w2hich are all before Bretton Woods on the highway.
I'll plug my area for a different feel. Middlebury College Snowbowl in Vt. Small area,very affordable, limited amounts of terrain compared to the above places but there will be no crowds, even if the parking lot looks full you will not stand in line at a lift for more than about 2 -5 minutes , I know some really good instructors there that can work with your daughter on her skiing. heres the web site www.middlebury.edu/snowbowl have a great vacation