As a mourner isn't allowed to care for herself, much less other people, I bought food for the family - a half dozen mini-calzones because I have no imagination and, it being the Nine Days, meat was out of the question. I figured her husband could toss them in an oven or a microwave, and they'd freeze well.
She's also not allowed to greet anyone, or get up to meet them or escort them out. This is very difficult. She feels rude, but she's allowed to be rude. In the first few days, this is actually fine. All she wants to do is sit there, be taken care of, be...a mourner. But by the end of the week, she wants to be up and doing things. I know I felt that way, and I think that's one of the best effects of shiva - it makes you want to be part of the world to some extent.
We, the mourner and I, speak a similar language for all she's ten years older. We both come from non-religious backgrounds, so I knew what questions not to ask. We're both science fiction fans. We're both therefore familiar with the concept of chosen family. I'm not going to say we're especially close, but we *are* friends. When I moved, they would have had us over for every holiday and Sabbath meal if we'd needed it. However, we'd chosen an area full of friends and chosen family, so we didn't have to impose.
Most of her local friends aren't SF fans, and most were raised religious. While there is the language of the religious that they, and I, share, we're both still in some ways outsiders. I think she needed another woman with whom she can *talk* and who would understand all the issues, from the need for a good rabbi - she has a wonderful one - to why we don't hang around our houses in robes on Shabbat.
But to have it this time of year is strange. Everyone else is mourning, too, but she's mourning personally, and while she gets up on Sunday, Thursday is TB"A again. Gd has a reason for this, but it's still odd.
edited to get rid of bad formatting and to add that the title is part of the ritual phrase one says when taking one's leave of a mourner: "May you be comforted among the mourners of Zion and Jerusalem."