Trazadone is a type of sedating antidepressant that is usually given off-label for sleep at night. I'm concerned about her taking this medication, however, because it is said to be contraindicated in people with cardiac problems, especially in people with abnormal rhythms or who've had recent heart attacks and such. It also tends to be the cause of abnormal cardiac rhythms in people with various heart disease. As such, it may not be the best medication for her.

As far as Lexapro goes, I'm not confident that this is a very good medication for acute anxiety either. This is an SSRI antidepressant, and meds of this group usually take about 6 or more weeks to get the full effect, if ever at all. It's a very good drug for depression and generalized anxiety disorder that has lasted for more than 6 months. However, it sounds like her anxiety is more acute, resulting from the surgery. If she plans to take the Lexapro, I would recommend taking it at night, as it does cause some significant drowsiness in some people. However, she should become adjusted to this sedating side effect after a while, so if she's taking it for sleep, it may lose that effect relatively quickly as well.

I would recommend having her see a psychiatrist for more appropriate medications. Depending on her conditions, and the severity, and the medications she's currently on, a lose dose of a benzodiazepine might be more appropriate for her symptoms, such as valium, klonopin, or ativan. These would certainly make her feel less anxious, and help her get some sleep. Also, she might benefit from a medication called Vistaril at night, which helps sleep and anxiety. Lexapro might be good for long term anxiety and depression symptoms, but it really does not sound like the best medication for her situation.

I hope this helps!