She wasn't just a random congress person, she knew the Marine that was killed. The wife has since confirmed this version of events. Trump's bizarre assertion that he can back up his version, is the same exact bluff he trotted out to try and intimidate Comey. It is ok to say that Trump screwed up here, you didn't do anything wrong, but the amount of work you are doing to defend someone that 24 hours from now will likely say some more egregious crap is pretty sad.
Funny thing is, I went back and read what I said and, nope, didn't defend him. I simply pointed out that the comment, while likely true, was also insensitive and you have to be careful when giving condolences. I also pointed out that the Congresswoman's rush to politicize this is also pretty gross, and that I wish Trump could avoid engaging in petty disputes like this (particularly with backbenchers). all of that is a fair read on the situation.