i posted earlier about my breeding trio of mice. i'd like to thank everyone who responded, including Sonya. now, i have another problem. the other day, i checked on my trio and my second female(not the one who's been having the babies) was looking sickly. she wasn't moving much, looked like she was having breathing problems and you could see/feel her bones starting to show. a few hours later, she died. i froze her. what possibly could have happened? again, i appreciate any help/advice.

greg