Females are not necessarily bad, but I'd want to know a lot about her health first. If she's up for adoption try to find out why, her age, what kind of shape she's in, and if she has laid eggs before. Often females who have a known history of laying eggs on their own just continue to do it regularly if given the correct care. But, if you've never had a cham there is a lot to learn and be ready to take on, such as providing a egg laying setup that is just like one's she's used to (they can be fussy, and why not?). It's a matter of more education to set her up correctly, rather than being automatically a bad decision. If you knew some cham-savvy person or vet who could look her over in person that would help a lot. But, if she's really in dire need she will more likely get what she needs in a caring person's hands who is willing to learn than staying at an animal shelter.