Tip for food delivery? Bridal shower

My bridal shower was last Saturday. We had a modest catering spread delivered and set up by a small business (falafel platter, flatbreads, charcuterie, croquettes). In my opinion, the set up was not anything special and the food was mediocre. The items looked carelessly thrown on the platters and the quality of the presentation was lacking overall (cheap plastic tubs of dip and pasta salad which looked like they should’ve been poured into nicer bowls, for example). Food went to waste because it looked a mess and was not accessible (GF crackers we paid extra for were just in an unmarked open wrapper sitting off to the side). The catering was not cheap, the photos on the person’s website are beautiful, and the reviews were good, so I was expecting more and felt a little foolish. I was planning to tip in cash (which they said was preferred when we asked in advance) at the shower once the service was provided, but as the guest of honor, I arrived after the caterer had already set up and left. I am now faced with the predicament of wanting to support a small business, be courteous, and appreciate the service on a basic level, but also not sure how much to tip since I wasn’t very impressed. I would have to reach out to the caterer to ask how to get the gratuity to her at this point (venmo, etc) and I’m stalling because I’m not sure what’s appropriate. What do you think is reasonable in this circumstance?