Bama, I personally think the domain name will raise more problems than its worth ... the logo is easy to get the message across that its MS Managed, but its answering the phone or writing it in an email where there is no visual art to guide the viewers brain to seeing the 'ms' as 'miss/ms' .... I see 'ms' as in the condition multiple schlerosis ... so the site could give lots of wrong ideas about what it does. MS Managed sounds like a multiple schlerosis management site ...
But with all that said, its not like this is a corporate business with an IPO so people are generally more forgiving of not for profits ... and if you write the domain MSmanaged.com and include a slogan 'female volunteers' or something, then its pretty clear.
Here's a couple of really quick ideas - you can see its easy to give the right impression with a logo, its just all the rest of the correspondence that would be a concern.
Happy to donate a logo for the cause so have your wife hit me up ;-)