I'm sorry you feel disappointed in her response. She did email you when she got back - not as quickly as you would have liked and not the way you would have liked, but she did email. It might be worth talking through with her how you feel and what your expectation was, eg that she would email you immediately she arrived and that it would be a personal email rather than a generic one. She can then understand what you're looking for and either agree to that or explain why she can't do what you want.

In my head there are a dozen different reasons as to why she didn't email immediately etc and, for me, it would feel unreasonable to ask or expect my T to contact me immediately when she returned from a holiday, but that's me. The only way through this one is for you to talk to her and, if you need something really specific be very clear about what you mean, while knowing a generic email one day later may be the best she can give.