10 hours of instruction goes a long way. I am sure she will pick it back up quickly, it is like riding a bicycle.
And especially if y'all fly your own airplane and have so much "hand time" in it, that matters a lot because you can easily hand fly under the hood since you have the touch.
With 700 VFR hours and good experience under her belt, she should blow through the instrument training in no time.
And tell Leslie that 88 on the written is nothing to be ashamed of. Many of us got dumb questions with even dumber answers, some of us got the impossible endurance questions with blurred performance graphs and answers 2% apart, some of us got caught by surprise by other questions and have already re-read the offending chapters.
She didn't fail and what she didn't answer right offers a great chance for extra study.
Again, congratulations to Leslie and tell her to have fun under the hood because I sure am having a ton!