Hamster breeding question?

My female hamster Jojo is just over a year old. I adopted her from a rescue in October and she had given birth to a litter of 8 pups prior to that. Right now I'm not in a position to consider breeding her, but if I did, would i be okay? She had her pups last July, so would their be any addition risk because of that? Also how many pups would be expected of a second litter? I'm just wondering.