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No, she'll be fine if you're careful about it. She's white because she has several white marking genes (splash, hom appy, w2, w20) and an extensive white factor. Of those genes that are stacking up to make her all white, only w2 is somewhat dangerous. You'll want to watch what kit genes you cross her with so you don't do a combination that's too risky, especially since all that white factor does make risky crosses riskier.
This link should be helpful, especially the table partway down. The riskiest would be crossing her to a stud with w, w3, or W10. There are a handful of others that have a lower risk but still a risk
http://www.huntandjump.com/forum/discussion/16745/new-kit-lethality-and-kit-mutation-load-explained#Item_23

You are very welcome!