You can but depending on the relativity of the specified date, using present continuous could be confusing.
For example, consider if:
- it is currently June and "she is working in June and July as a nurse". This works very well.
- it is currently March and "she is working in June and July as a nurse". Okay this still works fine
- it is currently 2022 and "she is working in June 2040 as a nurse". This is a lot stranger but the only thing that's changed is how far off it is from now.
In all of these scenarios above, "she is going to work in as a nurse" work very well. Similarly so for "she will be working".
Also because things may change overtime, while "I will be working some job 10 years from now" is correct, one may prefer to indicate the present "plan" for the future to account for change overtime like "she plans to work in" or "she is planning to work in" which is present continuous and works because she is planning now to then be working whereas "is working" implies now into the future.