In my opinion you should give her a decent rest (at least a couple of months)
and a chance to fatten up a bit.
Also, I'm not positive about Jackson's, but she may become pregnant again due to retained sperm from the original copulation.
I know for sure this happens with egg-laying species and it seems to me that I read it could happen with the "live-bearers".
Someone else will have to confirm this or set me straight as I wouldn't bet much on being right about this.
-Brad