"I've done preparations more times than I can count already."
You can't count up to 5?
There is no indication that she died additional times not shown here. 1 and 2 were the initial deaths. On try 3 she had to change into her own dress in the morning and later into Linus mother's. I wouldn't count putting on her nightgown to sleep, as the context is about getting dressed, brushing her hair and making herself presentable, leaving us with the fifth time she had to dress herself now.