Well, ok. I own a <a href="http://www.sunbicycles.com/product_detail.php?short_code=EZ-3+SX+Tadpole&cl1=RECUMBENT">Sun Bicycles Tadpole Trike</a>. I had it for rail-trails & suchlike back when I lived in Missouri. It's currently wrapped up in a tarp here in Baltimore under my house. The front boom extends/retracts, & the seat slides forward & back - so I'm fairly sure you'd be able to set it up for her height. The shifters are swivel-shifters, so they're pretty easy to work. 21 speeds. And honestly? You need them. The thing is <i>heavy</i>, and especially if she hasn't built up much leg musculature she'll need those granny gears to get the thing moving. A 3 speed isn't going to cut it, especially the moment she hits an incline. The other big con is that you absolutely shouldn't ride it on open streets. When seated, you're about the height of a car's wheel well. Nobody, and I mean, <i>nobody</i> can see you. I'm a decently skilled cyclist, and I never rode that thing on the street unless I had someone else on a bicycle riding escort. I won't ride it at all on Baltimore streets. Other, minor cons - you can't stand up in the saddle to take the bumps out of the road - you feel everything that's under you. The pros are that they're a ton of fun. The grin-per-minute is very high. It's a very stable machine, unless you ride it like a hooligan, in which case you can get it up into a tiltie or power-slide it pretty easy. Ask me how I know. The granny gears work pretty well - with the right gear combo it's not hard to get it going pretty fast. I rode mine halfway across Missouri on the MKT/Katy Trail from St. Louis to Columbia, and had a ball. It's like pedaling a laz-y-boy recliner.