Football sized metallic object over wing at flying into Boise Thursday 5/26/21 at 4:21pm

My daughter - a registered nurse - was flying back to Boise from Boston yesterday, and she says she saw a UFO. She said that as the plane was approaching Boise, just as they were breaking through the cloud layer, she was sitting in the left window seat right over the wing. She was looking out over the wing and an object, “about the size of a football” flew right over the wing toward the wing tip, traveling in the opposite direction (toward the rear of the plane). She said it was very metallic in color, but could not describe the shape. She said it was not shaped like a football and said it had (angles). She asked the pilot as she left the plane if he had  seen it saying “ I asked the pilot he said no but kind of looked suspicious lol like he didn’t want to tell me yes lol. . . The flight attendant was like what was it? And I was like I don’t know that’s why I’m asking lol”.