Yeah... If you don't know her age you massively increase the risk of problems when you try and breed.
Even when people breed very, very responsibly it can still go horribly wrong. Increasing that risk is cruel to yourself and the hamsters involved.
If you're unsure then read about
the story of Hush Puppy. The only survivor of a litter bred by one of very few people I trust, who did absolutely everything she could, got it all right, and still lost almost all the litter. We were all lucky Hush survived and her story really is one worth listening to.
It was heartbreaking for me and I only got to read about it once the worst had passed. Hush is a fantastic little sign of hope, but she's also a heck of a reason to think very, very carefully before you breed.
Please don't do this.