Most players like to stack their chips before they get involved in another pot. This doesn't mean they won't play strong hands. A player may even toss in a few chips on medium-strength hands as a courtesy while sorting through the last pot. However, there's one thing players will almost never do in this situation, and that's run a bluff from scratch. True, they may end up bluffing, but when they enter pots, it's almost always because their hands merit it.
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If this player becomes involved in a hand while she's still stacking a giant pot, give her credit for having at least medium power. Don't invest money on the hope that she entered the pot bluffing.