Breeding females is a long process the weight she has gained these three weeks you've had her is more than likely due to being well fed.
You don't think I am maybe over feeding her do you. I thought a couple of mice every 3 to 5 days isn't bad for her since she is an adult and only eats mice. I do not feed my rat eaters that much they eat every 7-11 days an appropiate size rat.
1.3 2010 Lemon Pastels
0.1 2010 Spider
0.1 2010 Mojave
0.1 2008 Normal
0.1 2009 Normal
1.0 2005 Normal
1.0 2010 100% het Caramel Albino
0.0.1 Crested Gecko
0,1 Leopard Gecko