new cockatiel - male or female? Is she/he healthy?

Question
Hello!

I have an one year old male common gray cockatiel and today i bought him a pair. There are only petstores in our town so I didn't have any other choice to buy a bird (breeders, for example). At the store they've told me it's a female bird, but i haven't seen any markings on the tail or wing feathers, they're just gray. The new bird is lighter in colour than the old one and her cheek patch isn't so bright either, that's why i let myself be convinced that she's indeed a SHE. I looked for pictures on the net and I think she might be a Cinnamon tiel, not a common gray, but I'm not sure.
http://picasaweb.google.com/balla.ildiko/Tiels i've posted some photos of her here, sadly they're not too good but i don't want to frighten her by taking her out of the cage just yet. Perhaps you could tell me, is she indeed a female? Is it possible to have a female greyish looking cockatiel with absolutely no tail or wing barrings or spots of any kind? Her face is light yellow, the whole bird looks like my older male just - lighter. She's younger so i thought perhaps that's the reason. By the way, I keep them in the same room - don't have other possibility, but in separate cages.

The other thing that really concerns me that her beak has some breakings, it's not uniform at all, looks kind of strange. She ate some seeds this evening and besides being a little fuzzy i can't see anything wrong with her but the beak thing really bothers me. I've posted a close-up picture of her beak too, it's the last one in that album. I don't have any possibility to take her to an avian vet because I do not know any in our town (Tg-Mures, Romania). There are vets, but not specialized in birds. I have spoken to one but he said that if the bird eats okay and looks normal I shouldn't take her to the cabinet because it's stressful for her.
Can you please help? Thank you very much!"

Answer
It's not possible to be 100% sure of the sex without a DNA test. Because she is lighter, it is possible that it's a girl. As long as you keep them in separate cages, there is no real reason to find out the sex of the bird.
Beak cracking is normal, so nothing to worry about. If possible, switch her to a pellet food instead of the seed food because seeds cause fatty liver disease.
Vitamin supplements would be a good idea if you're going to keep her on a seed diet.
So to summarize, you probably have a female (keep the two birds separate) and she sounds healthy. Her feathers look very nice in the pictures, so you have nothing to worry about.