Daisy's Mother?

[Matthew Williams]

I just happened to have re-read Carl Barks's classic story about Daisy
giving Donald Gladstone's love letters (from WDC&S 111) again last night,
and I came across something odd.  In the third panel of the ninth page,
Gladstone goes to Daisy's house and finds an older female duck at Daisy's.
Could this be Daisy's mother?  "Miss Daisy Duck" is the only name on the
mailbox, by the way.  What do all of you make of this?

Matt