Emotions for a submissive little is very high the do need to have that connection where they know the Dominant is there always for them . If they are in sub drop or upset from day to day living , they know that he is around to help her . Set boundaries so that you both know you both will text or chat through the day , even if just to say hi this helps her to feel she is wanted if she does not hear from her Dominant for a day then the emotions serving and she thinks she has upset you and over thinks everything .
It is the same for a submissive especially in sub drop they do need know you will be there to help just to chat and give them praise and encouragement to get them out of sub drop . It's not a good place to be in and mentally can be damaging to the submissive , and it can last two or three days so you would to call her everyday to see how she is going .
For me I make sure we have talk about the boundaries and what we do if the emotions take over her , make sure you keep in touch with your little submissive everyday and always praise her even for the little things she does . It helps to make them know that you really care for her and that you reliable and do as you say , don't ghost her for a day or two and I would never use as punishment unless she has seen really bad . Even then tell that she can not talk to you for the day no longer and why you doing it , but then everyone is different but the emotions are real and are there so they need to be addressed not ignored .