While Al was fetching her drink, Hermione had ample time to ponder the "Jamie situation", as she had come to refer to it as.
When Al had first left she had thought of going to find Jamie, but then thought better of it. She still felt so awkward and embarrassed by Ron's behavior, but with her busy schedule she hadn't really had time to sit down with him and have a proper talk. She hadn't really had a chance to observe Jamie and Sirius together, but from what she'd managed to overhear, they were happy and well suited for each other. This party, Sirius' party, probably wasn't the best time to bring up the subject, but that didn't mean she couldn't observe from afar. After all, if she was going to attempt to convince Ron of their happiness, she needed to have some evidence.
Just then Al returned with her drink, and in a gesture purely born of Albus' quirky nature, suggested a toast. Laughing Hermione agreed