My daughter who is 2.5 year old has a wart on her eyelid. how can we get rid of it?

Find a dermatologist: These are difficult at any age & particular in a 2.5 yo. I would consult with a dermatologist who works with kids & see what your options are. They can at least confirm the label & exclude a similar cause. Depending on their comfort level they might have an office treatment or suggest removing it under sedation/anesthesia.