You need to make a decision NOW if you are going to be going home for the summer.
Then, if you decide that you will be going for sure, you need to let your MB know stat, lest she be left high + dry w/no childcare next month.
If it makes you feel better, let her know via written communication about your plan to visit family this summer.
Then when you see her next time, you both can discuss what can be done, etc.
Good luck!