I'm a forgetful person with the situational awareness of a dead sheep, and I'd like to give you some advice.

First, you should realise that these issues won't go away if only she "tries harder". I absolutely can't make myself un-forgetful or less dyspraxic, no matter how guilty I feel, or how eager I am to make up for whatever precious thing I broke/lost/accidentally set on fire last. Making your wife feel bad about these things will only make her more miserable and will accomplish nothing. You seem like a lovely chap who knows this full well, but I thought it was worth underlining.

Second, a lot of people here are armchair-diagnosing ADD. Who knows if this is the case for your wife, but I can tell you that for me at least there is no clinical diagnosis apart from "forgetful git". I have an excellent memory and great situational awareness for some things (that luckily overlap with my profession). In fact, if you see me blindly walking into something, it's probably because my mind was dwelling on some of this other stuff that feels more tangible to me. So, don't be hasty to diagnose anything.

Third, the reason I'm happily married is that my wife is an understanding angel who copes with my peculiarities gracefully. She doesn't get mad, she gently reminds me when I need reminding, and she often just fixes things up around me without saying anything (and then doesn't get offended when I don't notice). And no, she's not trapped in an ungrateful relationship perpetually looking after a man-baby. We both know what the "price of admission" is for a relationship with each other, and I do my fair share catering for her idiosyncrasies too. What I'm saying is that cheerfully coping with this stuff might be what's required to be in a relationship with your wife.

Lastly, I think it's important to keep a sense of humour about all of this. Yes, we congenital klutzes sow chaos wherever we go, but at least it's often amusing.