I don’t know about any of these programs (we use MOTL and just started Life of Fred), but it doesn’t look like you need to worry too much. You said she is going into first grade, but already knows most of the concepts for both of the first grade curricula you have. If you like Miquon, just continue with that. Since she may move into Saxon 2, just check to see that all the concepts from Saxon 1 are covered by Miquon. If not, teach them whenever you think is appropriate, and otherwise just enjoy Miquon.
At this level, I personally don’t think there is a lot to worry about with math. The concepts are pretty basic. My DD far exceeded anything in our province’s grade one ‘Course of Studies’ by just playing Jumpstart games before she even started school!
Speaking of which, you could always look up your state/province’s official course of studies to make sure you are hitting all the first grade skills in Miquon, and just supplement if there is anything missing.
Joanne