It's a parody kind of story where main female protagonist is the daughter of some financially influential count or Earl family and has her engagement broken of by her marquis heir fiance in love with a foolish barons daughter who thinks she can be heroine by following a certain novels storyline but she is a merchant through and through and protects her and her family honor while getting compensation out of the Marquis in the end she is engaged to the prince of her country who she helped from the stupid barons daughter Other info I remember on it is that she has doing brother and father and runs a successful fashion store for commoners and nobles alike. Sorry for the long and tiring description of the novel I vaguely remember
definitely not ik i was in a hurry going outside yep thats the one thanks loads man - also thank you guys for replying heres the link to anyone else interested https://www.novelupdates.com/series/mochiron-isharyoseikyu-itashimasu/