Were it me, given your requirements, I would opt for a couple of pans called "sauciers." This refers to the bowl-shape of the pan. Because of their shape they are about the most flexible design going, and can function as skillets as well as sauce pans. I'd get at least a 3-quart model, and have a couple of them.
My choice would be totally clad stainless, from a reputable company such as Calphalon. I'd avoid anything made by All-Clad, both because it's stuff is overly expensive, and because the company doesn't stand behind its warranty.
Making meals as you describe often involves handling various ingredients differently. So I would consider a skillet or two as well. That way, she could, for instance, be sauteeing onions while doing something else in the "big" pot. Same goes for a small saucepan, maybe in the 1-quart range.
I would also follow BDL's advice and get a pasta kit. Those consist of a kettle (usually about 8 quarts) with two inserts; a pasta insert and a steamer basket. The pasta insert (basically a slightly smaller kettle, full of holes) should extend as near to the bottom as possible.
By style of cooking I meant the physical relationship between the cook and the cookware. For instance, if she's the kind of cook who shakes, twists, and flips a skillet then the handle design and total balance are much more important than they'd be with somebody who plops the pan on the stove and lets it just sit there.
Should you opt for stainless, it is imperative that she learn to work over lower flames. Medium heat is about the highest she should ever be using. Stainless also works best if it's preheated for a minute or so before adding food the food.
There have been several cookware discussions here, over the years, and if you use the search engine you'll likely find several that provide insights towards helping you make a choice.