Well I AM a wife with Asperger's - diagnosed 4 years ago. One thing I can tell you is, when you've met one person with autism, you've met one person with autism. Meaning, it affects everyone differently.
I love to be touched/hugged by a very select few people: my husband, my children and my pets. Anyone else, I hate being touched by. Touching for me is a very intimate thing and it is an unwelcome false closeness from anyone else, even my parents, although I love them, I don't like to be touched by them.
I love the above-mentioned people very dearly so, yes, we can FEEL emotions. However, we're not always very good at expressing them.
I don't get hints. if you want me to do something you generally have to tell me explicitly.
When I am happy and everyone else around me is happy, life is good.
However, I don't deal well with negative emotions. People think we have no empathy, but the general view among the autistic community is that in fact we have too much empathy. We feel other people's emotions, we absorb them like a sponge. It's almost ESP-like. So when faced with negative emotions, that backwash is so unpleasant we shut down and try to shut it out, which is why we come across sometimes as Spock-like. I don't know how to react when faced with negative emotions. My natural reactions generally are not well-received so I end up asking how the person wants me to react. I've been known to hide under a blanket with my hands over my ears to hide from and shut out the negativity. If I can't shut it out, then it leads to meltdown, which is not pretty. That's when all the negativity I've been trying to suppress comes out in me and I lose control. Luckily it doesn't happen very often.
One of my biggest problems with relationships is conflict resolution. Partly because of the above reactions to the other person's negative emotions, partly because generally I don't know what it is I've done wrong and they generally don't actually TELL me), and partly because I don't have the first clue how to fix it.
Getting a diagnosis was very useful for me because it explained a whole lot about my difficulties and why I have them.
If your wife is receptive, get her to do the Aspie Quiz: Aspie Quiz
Then if the results indicate she may have Asperger's, she needs to go her doctor with the results of the quiz and any other evidence, and ask for a referral for a diagnosis.
I hope that's been some help to you. If you have any questions, please ask.