OP here. Thanks for all the comments. Sent the link to this thread to my friend. Hope she doesn't hate me later. I'd just like her to have a more gentle wake up call than I did.
One thing to mention, she didn't necessarily want her DH with her (not that he volunteered). Last time, he just complained about how long it was taking, about watching the kids while she picked the pictures, etc. It was harder for her having him there than not.
Also, last night he told her that she didn't ask forcefully enough. I guess she said, "Can you bring it, if it's no big deal." To him, it WAS a big deal, so he didn't bring it.

He told her to not be so wishy-washy in the future, and he would help her out. He just thought she was indifferent to having the pictures taken.

I guess that's why she spent 3 hours getting everything ready before hand - purchasing clothes, ironing them, getting them bathed adn dressed, stocking up the diaper bag, bringing toys, getting the coupons, etc. But, in his mind, because she said "if it's no big deal", she was indifferent.
She told me this morning that he did fully apologize before bed saying he should have brought her the wallet. Unfortunately, he followed that up with the fact that he was aggravated anyway, so at least if he brought it she would owe him.
