Here in NYC and I know Boston has one too, is an annual Vegetarian Festival.
Justice any other food festival, hundreds of vendors come to one site to promote their products. All offer samples to taste. And once you taste it, they sucker you in to their pitch on how great and healthier their product is from all the others.
Its a good place to go to see whats out there, taste whats to there and hear about their health benefits. These food shows also have many health related lectures as well. Lectures on how to have a balanced diet when vegetarian, protein substitutes usually given by physicians, dietitians ...And usually there are cooking demos too. It really is a one stop shop.
If your area has one of these Vegetarian food shows and she can attend, she may find products that she never knew existed that would be healthy for her, reduce the amount of carbs or other foods that add to her weigh gain, without you having to say a thing. It may not work, but its worth a shot.
All that being said, coming from a guy who loves to eat ( things that taste good), 1/3 of the stuff is better than you thought it would be , 1/3 is edible at best, and 1/3 is weird, freaky or just plain old crap. I find people who are enthusiastic about vegan/ vegetarian food ( and products) to almost be brainwashed into thinking their food tastes great, is the greatest meat substitutes, " taste just like chicken" even though they never had chicken before .....
And for some strange reason, %90 of the vegetarians i see usually look the most unhealthy (too thin, vitamin deficient looking,pale skin...) yet they claim to be the healthiest
In most cases they are relatively inexpensive to get into ($20 or less).
Just have to check to see if there is one near you.
***Just a warning, there are a few Ethical vendors too, so be prepared for the animal rights people and all that. Its not overwhelming or ' get in your face" like approach, but they're there.***
***Another warning: These events often attract very ' interesting' people. Not bad people, just Unique. great place to people watch. ***
Here is a general link to the NYC event, so you can get an idea of what something like this is all about
NYC Veg Food Fest
Here is a link to see the kinds of lectures they have at the event:
2015 SCHEDULE ¬ę NYC Veg Food Fest
Here's a link to the Boston Vegetarian Food Festival:
Boston Vegetarian Food Festival
Ive been to both the NYC and Boston festivals in the past. I would have to assume most major cities have them.
***Another tip: These festivals often get very crowded, and like many festivals, the vendors run out of samples towards the end. Makes sense to get their early to avoid the crowds, and to get to taste ( and take ) many samples***
A list of links to Vegetarian food festivals in the USA:
There’s a VegFest near you | A Life Vegan
Some of the links don't work, and I'm sure there are better sits than this to find one near you. Its just that its 4:30 am and Im not functioning at %100 yet