Well...not trying to fish for information, but alot of "what you could do" depends on what you two are into, and what her situation is. Depending upon that, I'd suggest things like self-bondage, minor public humiliation/exhibitionism, or servitude.

Things like: cuffing herself at home, with the keys frozen into a block of ice; forced to wear a short dress and no panties out; told to do chores naked, or with a vibe in. I think one of the more intense long distance humiliation orders I've seen was a sub told to wet themself in public. But like I said, it's all dependent upon your own interests.

Though it's not my personal cup of tea, you may want to check out the Academy and peruse the tasks listed there for ideas; most of them are solo/long distance things.