AITA for wanting a kid free weekend? lol?

my cousin asked if i would babysit her baby this weekend (keep in mind, the last two weekends he has been at my house)… my daughter is at her dads house til sunday, & i was looking forward to a much needed break this weekend lol, but she got all pissy with me because i said i couldn’t babysit. but like? if my own toddler isn’t gonna be here, why should i have to babysit someone else’s toddler? lol
i love this kid SO much, but i really need a break. i want a very relaxing weekend. :/