OK, I would go with the consensus of most others on here 
"It was only after her discovery of Design that she fell in love." or "Only after her discovery of Design did she fall in love."
The latter using more poetic license as canjowolf stated, though bzipser is absolutely correct on the context used.
You could have used, "After discovering Design, she fell in love with it." This assumes it was Design she fell in love with, as your sentence is also ambiguous (did she find love in Design, did she find a man after discovering Design, did she find a beautiful puppy which became the logo of her company ???
)
I have to say your GD teacher was right ... sorry Dalara
Oh, and the rest of your paragraph needs work too
EDIT: Next time submit your paragraph on here before you submit it

"It was only after her discovery of Design that she fell in love." or "Only after her discovery of Design did she fall in love."
The latter using more poetic license as canjowolf stated, though bzipser is absolutely correct on the context used.
You could have used, "After discovering Design, she fell in love with it." This assumes it was Design she fell in love with, as your sentence is also ambiguous (did she find love in Design, did she find a man after discovering Design, did she find a beautiful puppy which became the logo of her company ???
)I have to say your GD teacher was right ... sorry Dalara

Oh, and the rest of your paragraph needs work too

EDIT: Next time submit your paragraph on here before you submit it




