1) I would strongly suggest asking her :)
& then believing her ;) For true. The impulse to interpret, especially when it's not something we ourselves would want, can get overwhelming.
2) Something that's helped me in the past is to have a whiteboard on the fridge or bathroom mirror... Where people who need/want something from me can write down what they want that day/moment. From Hugs to Housework, Space to mind blowing Sex, Romance to Zombies. It's not a honey-do list. Nothing on there is required or being asked of me per se... It's just things my partner would like me to be aware of. What they're in the mood for. That way I can pick and choose what I'm feeling up for! :D It's kind of an ongoing compromise... If you define compromise where 1 person lists the options they can live happily with / want, and the other person picks the options they can live happily with / want. That way both people are happy. It also helps nix the "Nothing" & "I don't know" answers in response to "What can I do to help you?"... Because it gives them time to think, and it's an evolving thing. If today is a cuddle and tomorrow is space and the day after is dishes? Easy enough to erase. A fairly key point, however, is to have the word collage be more than 1 item long. Add & delete as necessary.
3) People all need/want different things to feel supported. To whip out another 5-thing, the 5 Love languages has some of the most common sense advice I've ever come across for how people feel & show love. This can also translate partially into how many people feel/show support.
Physical Touch
Quality Time
Words of Affirmation
Acts of Service
Giving Gifts
You see all of these things expressed when someone dies... Some people make food or clean house (acts of service), other people write notes & cards & talk (words of affirmation), other people send flowers or make photo collages or pay bills (give gifts), other people come sit shiva or make a point of visiting for a few minutes to a few hours every day/week (quality time), other people give hugs & kisses or hold hands (physical touch).
I'm a physical touch (& quality time) kind of person... When I'm upset my favorite things are sex, sparring, wrapped up in a bear hug, a movie marathon all tangled up & half squashed on the couch. My son, otoh, is giving gifts (& quality time). I can make him a duct tape wallet or oragami crane, or give him tickets to a sporting game or movie, or buy him a special treat (ice cream, trip to the water park, DLC for one of his games, etc,). It's not about the money, it's someone thinking about him & what he'd like, and the token of that thinking about him is the gift. My best friend is words of affirmation. Doesn't matter if one does everything in the book, she's going to feel bereft and alone... But if I tuck a note under the windshield wiper on her car? Hide a note in her pocket? Shoot her a text that she's amazing? OMFG thankyousomuchforbeingsosupportive!!! LOL. Which always cracks me up, just because these things take 2 seconds and seem kind of cold and uncaring to me. But to her, people are afraid to talk to her & say the wrong thing, and she just dies inside in the silence. So I do the things that make her feel better for her, instead of what makes me feel better.
Helping people the way they want to be helped I've just found to be a giant EasyButton.