Student said she will always be 20 minutes late to class because she needs to pump.

I am a mom myself, I know how hard it can be to pump and exist as a person. How am I supposed to respond to this when I asked a student why she was so late? She said that she has to pump at this specific time (I get it), so she will always be 15- 20 minutes late. Does she need a formal accommodation for this? I really want to be flexible to other moms, and it just feels she may need formal permissions given course content. Maybe she doesn’t? Thoughts?

Edit: I teach a grad class in a professional course that deals with important skills (think neuropsychology) so yes she will be missing important content that is required. Which is why I wondering about needing a formal accommodation.