Unfortunately, that's going to depend upon the terms of the QDRO and how it is interpreted by your plan administrator. I suggest you discuss the QDRO with a financial expert (a lawyer or accountant who works with QDRO's, preferably including those administered by your employer) to determine your ex-spouse's rights.

Ordinarily I would expect that your ex- would be entitled to appreciation on her share of the pension as of the time of divorce - which is to say she would benefit from the growth of that portion of the pension, but not the portion reserved to you or resulting from subsequent contributions to the pension plan. (But I've seen some crazy QDRO's, sometimes having effects that none of the lawyers or parties anticipated.)