It's possible it is Provia if she is using a newer Rollei with modern coatings. Either way, it is likely filtered a tad warm via a filter or natural light, I would be doing the same with Provia. Also consider the light, light is everything in a photograph, it is likely the second biggest oversight I see in enthusiast work that is lacking, the first being composition and third being exposure...
An example would be you don't take Provia to NYC with all the blue, steel and grey buildings and expect the same warm bounce as Paris.
I've had nothing but good results with Provia. It has natural, yet vibrant colours. It works in sunshine or overcast conditions.
Mind you, I don't develop it myself but I use a pro lab that does it absolutely perfect.