Write about me but I will say fuck you afterwards.
Despite his soul of color
Diversity of lights and shades
Velocity that never fades
And value for his every dollar
Faith and trust in three of spades
May you stay, free of aids.
I think that was good for being spontaneous lol.
And to stay on-topic... everyone needs practice. You can always get better (or worse, of course). As for things to write about, we advise that you try to write about anything at all that interests you (and if nothing does, you can always write about apathy; the nihilists will love you for it! :V). We (well, most of us) think that writing is genuinely improved when the author is writing about something with some kind of passion, and most often, that kind of passion comes from a sincere interest in what the author is writing about. Unfortunately, not knowing you very well, we can't really recommend anything in particular. ;9
Essentially, just write about what you care about. The rest will follow. :)
I disagree. Obviously a person's best work is most likely to come from a source of inspiration they have a lot of passion for, attachment to, and/or are intimate with, but that's certainly not an area a writer (or anyone involved in any sort of creative art) should limit themselves to.
Challenging oneself in this manner is a great way to improve ability. While you may not care much about the subject material, or even enjoy it for that matter, there is a lot you can learn from it. That's why when you go to school for writing, art, music, etc., you're almost never doing just the one thing in the field you want to do, you're exposed to all facets of that art form so that you can take from other areas and apply it to what you want to do. Also it's good to be versatile.
Not to mention that I think her intention is just to write a little bit on whatever not just for practice, but also for fun. I doubt she just has no idea of what to write about and has to ask us for ideas. ;o