Hi, ygarza1967! Sharon Gless has expressed an interest in getting Tyne Daly on the show. Here's an excerpt of
an interview Sharon gave TV Addict in July 2008:
QUOTE
So, do you sit there and go, ‘I have a son who’s a spy. Maybe he can come and take care of this little problem for me.’
[Laughs] Maybe! I don’t know, I have to wait and see. The very first… not the pilot, but then the first episode, I did get him involved with someone. A friend of mine. The neighbor across the street. And I’m trying to get Tyne Daly in here. Matt [Nix] says that he’d like to have her on the show.
That would be fantastic. That would be so cool.
Yeah. I want her to come and play my sister. Tyne is very funny and I said, ‘She can play my sister.’ Tyne smokes camels unfiltered, so… ‘The two of us could be doing this scene where we’re coming into the house and Michael comes in and he hates smoking. Hates it. And it would be very funny, because you can’t see anything in the house because it’s the two of us in there [mimes smoking].’ And I said, ‘Tyne, just come and play his aunt. My sister’s come to town.’ I said, ‘If you really want to get complicated, you could come to stay, and now he’s brought someone to put in my house.’ You know, he hides people in my house occasionally. So where do we put Aunt… Myrtle? Unless Madeline of course has to sleep herself and [GARBLED]. That was a fun one last year. Anyway, Tyne said, ‘I’d love it. I’ll do it, but I want to play her mute.’ Only Tyne Daly! And believe me, she’ll steal the show. And Matt said, ‘Nope, I don’t think so!’ Well, he wants to use her but…
Not as a mute.
Not as a mute, yeah. ...
Also, you can read more about Sharon Gless
in this thread as well.

Hope things work out with Tyne Daly guest starring on Burn Notice! She's a great actress.