It's probable the Daleks did not know what that fixed point in time would be -- perhaps she would turn out to be a fixed point in time in the future they were bringing about. They can't see the future, but apparently had some notion that it would be "wrong" (in the sense that Captain Jack is "wrong") to kill her.
It isn't stated what exactly the criteria are for making a point in time fixed. If there are rules, they may not be revealed to the audience. More likely, "fixed points" are entirely plot driven and in-universe explained just that certain time travelling characters/species are able to "feel" in some way.
I don't think we have enough information to say how much the Daleks knew -- perhaps they just got a queasy feeling and decided it was a bad idea without ever formalizing the thought "oh, hey, she's part of a fixed point in time".
The whole "fixed point" concept is firmly in Timey-Wimey ball territory; the only decent explanation in-universe is that the concept is too advanced for us to understand on any meaningful level either because of our relatively primitive science or because of a lack of some sort of temporal physiology. Out-of-universe, it is a mechanism to allow writers to sometimes block the Doctor from tinkering so much with time.
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