My mom hates garlic too. It makes it very challenging to cook for her...
especially since everyone else in the family adores garlic. But, I try hard to avoid using it when she'll be eating my food because much like my curry aversion, she can spot garlic in the minutest amounts.
LOL, once she even said that someone's garlic toast was too garlic-y - and it was made with garlic salt! (A substance, in my opinion, which tastes nothing like garlic)