Given that your manager is currently going through a grieving process, this is completely natural; it may take some time for her to return to her natural mood.
Now, as long as you and your team's tasks are clear and assigned, there is nothing to worry about in a professional way. Perhaps you will have to update and check on her more often due to her reduced disposition, and as a team you may all have to show a bit more initiative during this time.
However, if this situation is beyond the emotional aspect, and is affecting the way your tasks and work are assigned and reviewed, then with more reason you and your team will have to take a more active role in the meantime: update her often, think on options to suggest before consulting her, check on your teammates frequently and review yourselves, etc..
Also, if you feel like it showing some support to her can greatly help the grieving process, and perhaps aid on the team's productivity and task assignment. This part is tricky, though, as it will depend on your company culture and interactions. If you want, maybe try going with something like this (more effective if done in person):
Hello Manager. I am really sorry for your loss, and I admire the way you are coping with it.
I want to tell you that we all are in this with you; and you can count on us if there is anything you need, being it personal or work-related.