It's a valid concern, although with proper care and precautions, you can minimize the risks. Carboys can be fragile (particularly the cheaper, thinner ones from China), and are not as tolerant of rapid temperature changes as plastic fermenters. I.e, don't pour boiling hot wort directly into a room temperature carboy.
There are some precautions you can take that might help put your lady's mind at ease. For example, I
ALWAYS wear thick leather work gloves, like
these, whenever I'm handling a carboy (such as during cleaning, sanitizing, or harvesting yeast, etc.).
Additionally, I always have my carboys in a plastic milk crate when moving them.
Finally, I also use
Brew Hauler straps when lifting carboys in and out of my fermentation chamber.
So on brew day, while wearing my gloves, I position the (empty) carboy into the Brew Hauler straps, then lift it into the milk crate. I can then move it around while filling it with the wort, then use the crate to carry the now-full carboy back downstairs to my fermentation chamber, where I use the straps to lift it out of the milk crate and into the chest freezer.
Perhaps adding these precautions to your inventory of brewing gear would help ease your better half's anxiety?