Hey mom, your baby girl is growing up! that's what is happening :)
i understand how frustrating it can be and how tiring. i went through the same with both my kids, but trust me, as she gets more playful and active, she will soon start getting back to her nap time again. this is just a phase where she wants to be as much awake as possible and do as much as she can. be patient, keep trying to make her sleep, and get your rest too whenever you can