It wasn't alright. It certainly wasn't right for Ron to apologise; he had been doing more than enough for her over the last few days.
"No, I'm sorry," she told him, carefully brushing away her tears. "And I'm sorry that I took Ginny with me and I'm sorry that I told Michael he needed that book." Hermione was really trying very hard not to burst into tears completely, but she felt awful for Ron being so worried and having to deal with it all without her. And she couldn't help feeling responsible for both Ginny and Michael being in Flourish & Blotts.