Ultimate Spider-Man #120 (2008)

Liz Allen learns who her father is. The man she knew as an uncle by the name of Franklin Dukes, aka "The Blob," is actually her father. She is presented a choice between leaving with Magneto to live with her father in the Savage Land, or to go with the X-Men and live with them. Living her present life doesn't seem to be an option anymore. After Spider-Man takes off the mask for a heart-to-heart, she makes her decision.