How can you tell if a hen is broody? I have a hen who has been laying since January. Her name is Rosie and she is a mutt. She is a mix between a serema and something else. Here is a pic:

this pic is actually from awhile ago. Back in November
I was just recently on vacation for 1 week. I come home and I find her sitting in the nest box. I collected the egg from her and went inside(6am today). About 2(8am) hours later I come put and she is still sitting in the nest box. I go back inside. 2(10am) hours later I check again and she switched to a different nesting box. i check under her and there was an egg. I take it and put it in the fridge. I check back an hour later (11am) and she is still sitting there. The person who was watching my chickens said that she was sitting about half the day yesterday. Is Rosie broody or is she just lazy?
someone please answer soon because i would like to go and get her some eggs to sit on. I don't want to buy eggs and then it turns out she isn't broody. This is my first flock.
this pic is actually from awhile ago. Back in November
I was just recently on vacation for 1 week. I come home and I find her sitting in the nest box. I collected the egg from her and went inside(6am today). About 2(8am) hours later I come put and she is still sitting in the nest box. I go back inside. 2(10am) hours later I check again and she switched to a different nesting box. i check under her and there was an egg. I take it and put it in the fridge. I check back an hour later (11am) and she is still sitting there. The person who was watching my chickens said that she was sitting about half the day yesterday. Is Rosie broody or is she just lazy?
someone please answer soon because i would like to go and get her some eggs to sit on. I don't want to buy eggs and then it turns out she isn't broody. This is my first flock.