kosher for passover
"Kosher for Passover" has a different meaning than regular Kosher. She may use a protein powder that is Kosher in general for most of the year, but depending on its source, may need to be substituted with another product for Passover. "Kosher for Passover" designations are given by rabbis, and need to be on the label.
Even if she doesn't keep Kosher most of the year, like the special dietary rules for Lent, there are some people who only follow the strict dietary rules during the special holidays. Or maybe she is having company, and they would be upset if she had chametz in her house (see http://en.wikipedia.org/wiki/Kosher_for_passover)
For example, I have no clue whether soy- based protein supplements are chametz or not. Lentils are potentially chametz -- and I don't know whether soy beans are.
As a non-practicing Jew with Orthodox Jewish relatives, I mostly don't follow the rules, but kinda-sorta do during Passover -- at least with the one Seder meal we do. But I don't clean the house out or any of the (IMO) fanatical/observant practices. My Orthodox relatives wouldn't have so much as a glass of water in my house, no matter what time of year it was.
things that are Kosher are not necessarily Kosher for Passover. This is even true of matzoh. There is an added level of preparation in order to meet the more rigorous rules during the 8 days of Passover. Next time you're in the grocery, look at a box or two of Matzoh. The ones in the special section of the store for Passover (if your store has such a section) will be marked "Kosher for Passover." The rest of the matzoh (that you may find in another aisle with other "ethnic" foods will only be marked "Kosher," and may even be marked as NOT Kosher for Passover.
I can't believe how nasty and judgmental your responses are. What did the original question poster ever do to you that he or she deserved your venom?