Holding a feather up for that long is a second year advanced test of power control, not an entrance exam. Holding up multiple objects, especially a 1,000 lb table for several minuets is unheard of. Phoebe has been using telekineses in place of hands since she was born so it is mental muscle memory for her and she is powerful.

Lilith has a magical condition where she absorbs too much magic from her surrounds and when it builds up too much to contain it causes wild surges of uncontrolled magic to burst forth. Usually such conditions are a death sentence among wizards for public safety. Her parents desperate to save their daughter tried something very unorthodox to save her. Generating matter is the most draining form of magic so they put a permanent spell on Lilith all excess magic produces milk. The thinking being was the excess magic could literally milked out of her body.
It worked but as a side effect Lilith's breasts grew bigger and bigger as she grew up.

Yes, I did look for a Pika sounding name, but more important to me was the meaning behind the name. The name of the French surrealist, Francis Picabia, could make a lively, creative choice for the daughter of adventurous art-loving parents.