Wanda should be able to remember the previous messages of the current conversation and answer the queries based on that. Note that this should be a configurable (probably using a toggle) option.
If the conversation is very long for a model's context limit, the conversation should be summarized and read.
There should also be a clear conversation button or link which will clear the conversation memory).
Wanda conversation should stay with the scope of the user's login session unless cleared manually.

This might be a very huge task - so, submitting patches in parts is recommended