She's not an Ootsutsuki. Uzumaki are only distant relations to the main line of Senju, and Hyuga have nothing to do with Hagoromo's line. Going by the logic that two very distant relatives making a child makes them an Ootsutsuki, you can say that about everyone.Yeah, Boruto.
Himawari isn't even a Hyuga she's an Ootsutsuki.
Besides, melding the power of Uchiha and Senju doesn't make you one either, it only simulates it. To be born an Ootsutsuki, you need to descend from their clan, and if there's any left, they live a long way from Earth.