Since I was the one who bought the toys - my problem was the opposite. How to interest her in toys. However I think the experience can be useful.
I started with a simple clitoral vibe - that helped her achieve orgasm more easily. Once the 'pressure' to have an orgasm was lifted - she actually wanted sex more often. The reason for the discomfort was me - I was determined to make sure she had an orgasm every time and that was sometimes hard for her. As you know - the toys solve that problem rather nicely.
From there we progressed to penetrative vibes, then dildos, then anal toys.
One 'carrot' for your friend might be this; after my wife has her first orgasm with the toys - it is easier for her to have additional orgasms. Sometimes this would lead to the infamous simultaneous orgasm - they are always fun.
A second benefit is that since you/she have already had an orgasm me/he can focus on what it takes for our own orgasm - not having to hold back waiting for our partner. This can be an issue - because most men are one-and-done types and most women are easily capable of multiple orgasms. The toys help level the field.
The next suggestion is to make sex more like play - than some romantic or spiritual pursuit. When you've been together for a long time, passion slips - but the fun must continue. After all - what's playtime without toys?
Ok - enough already - good luck with your friend!