How big do a Chihuahua dachshund mix become?

[Michelle ^]

I have a 10 month old female dachshund chihuahua mixed puppy and i'd like to know how big they become? She has a younger brother that is bigger than her so i'm wondering if its only the males that grow? If not how big do the females grow?










ALSO. How long do this type of dogs stay in heat? I heard from somewhere that smaller dogs like her stay in heat longer and bleed longer?



I'm a first time dog owner so i'm not really sure on these things ^^
EDIT: I plan on her having a litter when she gets a bit older but as of now i'm content with just her.
EDIT: BEFORE any of you start to accuse me of anything like others i'm not going to MAKE money off of her having pups, I would NEVER do that. And i am only in the stage of THINKING of letting her have pups, I have the money anyways if she did get pregnant. So please don't start saying things and accusing me of wanting her to have pups just to sell them.