Was I rude?

I have this lady on my social media that does not engage on my posts, does not like my posts, etc… all she does is randomly send me private messages to ask me where I bought an item that I am wearing in a picture from(she could have liked the post or commented on it to give me some engagement but she didn’t)… I always reply back to her private messages and I tell her where I bought the things from. Today I posted a new picture and she sent me a private message again asking me where I bought my shoes from, I didn’t want to tell her so I told her that I am not doing an AD for the retailer so I don’t want to share that information. She then said that I am rude? Do you think that my response was rude?

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I care about engagement because I am a content creator.