I've used this with my whole class (and then had some individual schedules for some of my special students.)
I took actual photographs of the child(ren) doing the activity and mounted it on sentence strips (my dollar store has them or you can get them from a teacher's supply) I used a pocket chart and in the morning, we would put the pictures for the day up and go over what we would do and discuss it. I did write a short sentence (go to the library. read a book. have Math Circle. etc.) I had "We will" above the pocket chart.
You could have: wake up, brush teeth, potty time, eat breakfast, go grocery shopping, play time, etc. Try to involve her (and her siblings) in the pictures and the planning.
I also had the time posted, but that was because we followed a pretty strict schedule. It really helps provide structure and I didn't have kids asking me what we would do next. I also used it at the end of the day to review what we had done that day. I also didn't have to constantly tell the kids what to do. It gave them a sense of control. If they were in workstations and the bell rang, they would clean up and go to the carpet with a book until the rest of the class was finished--I didn't say a word.
Now it did take time and effort at the beginning of each year to establish the routines, but it was well worth the effort. I not only taught the schedule, but I taught them how to clean up the workstations, how to line up, how to walk in the hall, etc. If we were doing something different (like a program, etc) I also outlined my expectations of their behavior. We discussed everything.
Actually, I wish I had known how to do this when my own kids were little. We often say "clean up your room" and don't realize how overwhelming it can be if they don't know how to do it! (think about how overwhelmed you feel when the house is messed up--and you know how to clean!) Or go somewhere without really teaching them our expectations of their behavior or providing them with something to do. (Again, think about how unsure and stressed it feels to be in a new situation.) It would have saved both me and them a lot of stress!
Another thing, at the grocery store, could you give her a "job?" Maybe 3 or 4 items she is to help you find. Pictures of 6 apples, 2 cans of pork and beans, 1 bottle of Dawn. You can find pictures in advertisements that are sent in the mail or magazines. Having a job to do might help focus.
Sorry if this was TMI. I learned more in actually working with my young and special needs classes than I did getting degrees in both Child Development and Early Childhood Education! Nothing beats experience!! I didn't go back to school and get my degrees until my kids were out of high school....