"Really? But I didn't notice that you were embarrassed!" Manuela West said coldly, still annoyed that Aria Grant had called her over, but not really taking it to heart, as Manuela had never been treated like this by anyone before.
Rather than saying the situation got worse, it's more accurate to say that Manuela didn't treat Aria Grant as an outsider, which was why she could speak so straightforwardly.
Aria Grant couldn't understand and thought she had made a huge mistake. However, David Thompson could understand, so he kept giving Aria hints behind Manuela.
Aria saw and didn't know if she misunderstood, but anyway, Aria felt like she had nothing to fear. If she got it wrong later on, if she got closer to Manuela but Manuela treated her coldly, none of these things were a big deal either. Thinking this way, Aria didn't feel afraid anymore, so she just went ahead and grabbed Manuela's hand.