Not personally, but I've barely been on the shot for a few weeks now. Still, nausea has not been one of my symptoms. I was getting night-time nausea on occasion when I was on the pill but it wasn't regular so I don't think it was related.
However, many women do experience nausea on hormonal birth control so it's entirely possible. She should call her gynecologist and ask if this is a symptom of the shot. Otherwise, why not consider that she's actually sick?
I had some nausea with my last couple shots. I ended up having to change bc because I was having such bad symptoms at that time. I had also been on it for about 3 years with no problems before that. My husband was convinced I was pregnant! So like Eiri said maybe it's the shot and maybe she just sick!
I had (only with the last couple shots I had) headaches, nausea, loss of libido, and low energy. All things I had when I was pregnant with my son. But low and behold I wasn't pregnant this time! Hopefully her nausea goes away and she starts feeling better!
If it is getting worse and or more symptoms are starting she really needs to inform her dr. They might be able to tell her or maybe even rule some other stuff out for you. My dr got after me for not coming to him sooner! He said there was no reason to go through being misrable (sp?) so she probably should just give her dr a call