I have a female pastel who has laid a substainal number of slugs for two years in a row,

Year 1: She is only 2 years old, but over 2000 grams (solid but definately not overweight). I breed her to my spider and get 4 slugs and 3 good eggs (no bee)

Year 2: I thought I might give her the year off, but she gained back all the weight plus some and was showing good signs, I pair her with the spider again and get 8 slugs no good eggs

The spider fathered another clutch of 8 fertile eggs, so I don't think he is the problem.

So, do you think that she just isn't a good breeder? Should I give her the year off and try one more time? I had a clutch of 8 and a clutch of 7 from girls that are in the same rack, so I don't think its an environmental issue.