Memory Maker with Extended Family

[labdogs42]

So, we are going on a trip with extended family right after Thanksgiving. My sister in law arrives two days before I do. I purchased Memory Maker and we are all linked in MDE. Will my SIL's photos already be linked to the Memory Maker that I purchased? Will I have the option to download her photos? Or should I give the MM card to her to take to the parks?