I agree with Robert's comments - there are too many people breeding from crap pigs and there will have been a reason why she was sold as a meat pig.
Don't waste your time - find yourself a good pedigree breeder (even if you don't plan to breed pedigree yourself) who will sell you some good stock. Aside from the finer points of pedigree breed standards (colour, markings, etc), above all, a pig has to be functional - that is, she has to have all the qualities needed to go through mating, sustain a pregnancy and rear a healthy litter.
To be honest, you seem a little unsure about whether you want to get into the breeding side of things at the moment. If that's the case, don't rush it. Carry on doing what you are doing at the moment - buying and rearing - and don't let others persuade you into doing something you're not ready to do.
However, if you do want to go ahead, spend as much time as you can with a good breeder, be there at a farrowing if you can, and learn as much as possible before you make a commitment.
Oh, and don't be afraid to come back and ask more questions!
Good luck and all the best
Liz
PS. I'm doing a series of features for Country Smallholding magazine on starting off with breeding. First one is in the next issue (October but out September). May be of help.