What a timely issue!!!
As a chapter advisor and someone who has been a part of different alumnae chapters, it is definitely a 2 way street.
The collegiate chapter has to keep the alumnae informed so she/he can come/donate by mail/feel a part, etc. but the alumnae also has to do her/his part by telling the chapter, either directly or though the IHQ website, where she/he is and when contact info changes!!
Don't forget, the chapter can't mention what you are up to if they don't know!