chicken has at least 24 eggs she is sitting on!!

My chickens are about 5 months old and about two weeks ago I started getting one to two eggs a morning. I went away this weekend and had family watch over my chickens. One chicken ran out of the coop and hasnt returned. We found her under the shed with at least 24 eggs! there are about eight pushed out of the nest! I dont see her leave and the food and water a quite a distance away.. should I leave food and water out for her nearby? she didn't leave the nest all day yesterday... is this ok? 

obviously this is my first time raising chickens and ducks, wasn't sure what to expect, something did get into the eggs that were outside of the nest. She is under the shed on the outside, you can only see maybe two inches of her under there. the 6-8 eggs were not even under the shed, they were outside and something got to at least three of them. skunk, squirrels??? so I should leave her then? I was thinking of trying to get the eggs and put them in the coop maybe she will stay in the coop? but I will just leave her be. I think she is still laying??? will she stop laying ?? I just started getting eggs for two weeks now. I guess it was longer than that if she has that many under her. I saw her this morning, she came out and ate a ton! then went back. She is being a great mom.. just worried about her at night since she doesn't go into the coop at night. 

thanks so much... we put a game camera up to see whats been at the outside eggs.. its squirrels. I think the other chickens are laying beside her because there weren't any eggs outside this morning but my father in law checked later morning and found three eggs outside. could this happen? the other chickens laying their eggs next to her? Went to go close the coop up and am now missing another chicken! So she must be somewhere with a clutch of eggs as well! My goodness.. I didn't realize this would happen.. so soon! I thought maybe after a year or so but they are only five months old! I am not sure the kind they are.. I have three brahmas one of them a rooster and three white chickens but when you look closely they have what looks like "dirty feathers" that are off white/cream with black splatter here and there. two of the three white mystery chickens are the ones brooding.

I now have one missing chicken (white) I can't find her and its been three days. We kept the game camera up and noticed that there is a raccoon trying to get at the one I found under the shed. I had put a chicken run over her and closed both doors on each end. I open it in the morning so she can go out if needed but my other chickens (and ducks) attacked her?? Is this because she hasn't been with them for a week? I want to put her and her nest in the coop but afraid the others will hurt her. I checked on her this morning and noticed her tail feathers were sticking out of the run and it looks like it was chewed! My poor baby.. I feel awful.. should I make another coop to put just her in it?