In order for her to be happy, she has to know what's most important to her. For me, matching is not important. I want to get the best of each appliance (for me) regardless of brand. For example, I would consider a Miele oven and maybe a Miele dishwasher, but Miele's cooktop does not have the specs I'm looking for, and I don't think they even make a range. But although my appliances will not match, I do want the overall appearance of the kitchen to look beautiful when I'm done renovating and spending all that money. I don't think I'd like the looks of a GE Profile speed oven mounted over a Thermador oven, for example.

I do not remember all the specs of the oven of the Monogram range (because I'm getting a rangetop and wall ovens), but the Monogram rangetop is near the top of my short list of possibilities.

I like that the burners will all go from simmer to 18K BTUs. If all the burners can simmer pretty low, then why not have the higher power on all of them also? Just seems more flexible to me.

I like that the simmer comes from dual-stacked burners, not cycling on and off (as in the Thermador).

I also liked the grate design and build quality of the Monogram. The grates sit nice and close to the burner. There are nicely-thought-out details in the design.

As far as the dual fuel, I cannot imagine your mom being unhappy with a true convection electric oven. The electric oven has generally been regarded as better than gas for baking, hence the dual fuel in ranges.

From my research, I think GE has a history of being good with warranty service. I feel comfortable buying the Monogram rangetop, while I have eliminated a few other brands because of high rate of repairs and/or terrible service.

One consideration AGAINST the 18K BTUs on every burner would be if more powerful (and expensive) ventilation is then required (or other installation requirements), yet you end up rarely/never using all those BTUs. I don't think this is the case for the Monogram, but be sure to check the installation manual for the requirements of each range you consider. Some of them require clearances you might not have, for example.

As far as fridges, no one can answer that question for you. She has to think hard about how much fridge space she needs and where it would best fit. For example, if she entertains a lot, she may prefer a separate fridge for drinks, away from the main prep area. One huge fridge near the prep area may create a traffic flow problem. And putting the fridge far away from the prep/cooking area is inefficient for prep. Also consider that operating more fridge space than you need is an expensive ongoing maintenance cost. Many people simply don't clean their fridge out often enough. My mother has shelves full of condiments that have been there literally for YEARS.

One last bit of advice: take your time and be thorough researching appliances. Appliances are the heart of function in the kitchen, and they vary widely in price, features, and quality. It is a much bigger task researching them than I had imagined. It is helpful to talk to many different knowledgeable sales reps. It is helpful to keep a spreadsheet of features and prices of different models. And it is ESSENTIAL to read the product manuals.