I love that this chapter shows that Aria does really care for Annie, even if she's always claiming that she only uses people. Cause remember, Aria didn't have to turn back time when Annie got poisoned.
All she needed was proof there was poison, which Annie was proof of, and Veri was going mad and shouting about how it should have been Aria that was poisoned, which others would have probably heard. Thinking in a purely utilitarian way, Annie didn't have any real 'assets' for Aria to exploit anymore, Aria already had a good relationship with the perfume businessman which his and Annie's relationship would really change, she'd used her brother to accumulate wealth, and she already had the support of the maids since Annie was originally supposed to be an example of how being on Aria's side would benefit them.
But Aria still turned back time, not really putting herself at risk since she didn't drink the poison, but it shows that Annie still matters to her.