Unless the stuff rubbed off on you, she applied that much earlier and perhaps even days prior to your visit.  So many men are so clueless about what we ladies use/apply for various purposes lol.

If she were applying bronzer, or tinted moisturizer/lotion etc., to her ENTIRE BODY then she may have had a very good reason for it.  I've used stuff like that to cover up bruises, but that was back when I was still dancing.  

I'm very pale myself but do not get tan in the sun.... I burn.  Very easily.   I used to do the tanning beds, but I noticed my skin was changing/aging rapidly: it took me many, many sessions no more than a couple of days apart to work up to a base tan, then I had to keep tanning every 2-3 days just to maintain it. So not only did it take a noticeable toll on my skin, it ate up way too much of my time.  

So now I fake tan from time to time.  So sometimes I'm pale and sometimes I'm not.   I don't get the spray tans done, I use at-home self tanners and the result may not look like a natural tan, but it isn't orange either.  The spray tans do have a very strong odor, and I personally find I can still smell it even days later so I won't do those.  

Why do I fake tan? I think I look better with a little color, and have noticed I get more compliments on my physique when I'm a little tan vs Snow White Pale.    
~I once read somewhere that you can look 7lbs thinner when sporting a tan.  Not sure if that's true, but it may have something to do with why a lot of fitness models and virtually all professional wrestlers (Sheamus and Paige are two gloriously pale exceptions) are spray-tanned to here and gone. LOL.  Ok, back to the topic........~

It's a good idea to ask about things that are a lady's major attraction for you.  I've had guys ask me if my hair is the exact same shade as in my photos, if I'll be wearing that red nail polish, etc