Whoa - loads of questions since the last visit
In some kind of order, then...
1) The Jessops neoprene strap is
this one
2) I got diamox from the GP on NHS prescription (I've got a great GP - I paid £10 for a private prescription for the antimalarial tablets, and then £3.25 each to fill the two prescriptions at the pharmacist... bargain! I think it will be very unlikely that anyone else will ever beat this - even other people in our group had to pay more). Most people have problems getting hold of it because there's no official dosage information for use as an altitude sickness treatment or prophylactic, and some doctors outright refused to prescribe it.
I had a moderate headache for about 4 days (from about 15k feet upwards) which was controlled with 400mg ibupfrofen tablets - which were technically for treating tendonitis in my arm, but came in invaluable for both the headaches, and also when I strained a ligament in my leg on the second day!

Yes, diamox did improve throughput - plenty of "diamox breaks" were taken on the way up, which is fine for blokes, but not quite as convenient for the ladies!

Most of the group had to get up several times each night to empty out, but I managed to get away with holding it until the morning... sorry if that's TMI for anyone
2) Yes, the Lowepro mini-trekker was a bad idea; I've actually got a small holster style bag that would have been perfect for just the camera/lenses that I was carrying, so in hindsight (and as a recommendation for anyone else!) I'd have taken that and a rucksack that's designed for trekking - most people managed with 35 litre ones, but of course, they didn't have chuffing great cameras with them...
3) Yes, that's a lioness there! We were in safari jeeps, so reasonably safe, although saying that the lionesses were only about 1.5m away from us at their closest (see some of the other pics on Flickr!) and I'm sure that they could have jumped up and got us if they'd been so inclined...
4) Dirty sensor? Where?

It was thoroughly cleaned (pec-pads and eclipse fluid) before leaving home, so all of the crud accumulated thanks to the push-pull zoom of the 28-300 lens. Not really much I could do about it in the field (and to be quite honest, I hadn't noticed - it doesn't really show up on the LCD display) - but yes, I do need to spend a bit of quality time with an image editor to get rid of as much of the muck as I can...
5) In hindsight, now that all the aches and pains have gone, the memories of the sleepless nights, uncomfortable ground, freezing conditions (-18C up at crater camp overnight - brr!), stinky clothes, general feeling of being filthy and unwashed, etc. then I'd say it was an extremely good experience

If you'd asked me a day or so after I'd got down, then I'd have said no - don't do it!
I think that it is false economy for people who try to ascend too quickly - yes, they may spend less time sleeping rough and uncomfortable, but the liklihood of not making the summit is massively higher than if you take it slow; I recall someone saying that something like 40% of the 15,000 climbers per year don't manage to reach the summit...
It's imperative that if she does do the climb, she has good kit - decent broken in boots, warm clothes, water/windproofs, quality sleeping bag, etc. - and also having bottled water was very convenient, and saved lots of unpalatability and queasiness that arises from the various water treatment processes. Feel free to bung any other q's via PM!