It depends on where you are. I’m assuming that you are in the United States, as most who post on this forum are, I think.
In the United States, Our Lady of Guadalupe has been elevated to a feast (in Mexico, I believe it is a solemnity). The reason for this is two-fold. First, there are many people of Hispanic descent in the Church in the United States. For these individuals, the celebration of Our Lady of Guadalupe is very important. Second, this feast should be important to others in the United States and throughout the Americas, as she has been named Patroness of all of the Americas.
So, what does this mean with respect to the liturgy on that day, both the Mass and the Liturgy of the Hours? Effectively, it means that the optional memorial of St. Jane Frances de Chantal is never celebrated in the United States or Mexico (the only exception being if there was a local solemnity honoring her).
In the rest of the world, Our Lady of Guadalupe is only an optional memorial (much like the celebration of Our Lady of Lourdes is here, for instance). In those places, you have a choice. But here, since Our Lady of Guadalupe is raised to the level of a feast, and it is always obligatory to celebrate a feast, and since feasts always trump any other memorial/optional memorial that may be on that day.
So, the short answer to your question is just ignore everything with respect to Jane Frances de Chantal.