I just thought of some things- I'm sure you've already thought of them but in case not, here you go.

Food- stock the freezer with as many prepared meals as possible! (if you need ideas, let me know) Take Missy shopping and make sure she has healthy snacks/meals that are quick to grab during the day. (that was my biggest struggle was eating when DH wasn't around because it took to much time and energy to cook) Hamburger helper is great- you can even cook up the hamburger meat in bulk and freeze it in 1 pound baggies- makes it even quicker to prepare. Along those lines is chicken/tuna helper with canned chicken/tuna!

Stock up the house with non-persiables that she will need- toilet paper, paper towels, soap, shampoo, toothpaste, etc- it will mean one less trip for her later down the road!

Missy- LET YOUR MOM CLEAN THE HOUSE! She is awesome at it! She cleaned for me when Misha was born- she cleaned things that had never been touched the 2 years prior to Misha and won't be touched until number 2 shows up and I sweet-talk her into cleaning again! (hmm, maybe I should keep having kids so my house will get a regular deep cleaning)