Next DNA Q

[Merry]

I clicked 'View all DNA Matches' and then 'Search Matches'.

I entered my father's surname and got two trees come up with potential matches (I note the Ancestry member on my DNA matches who actually has my dad's surname didn't appear!).

I opened the first tree and found that they had my 3x-great-grandfather on their tree. From this I could see they are my 4th cousin once removed and I already have what's probably either her father or uncle on my tree with a photo of him at one of his daughter's weddings (so in the past I've been in touch with the dad - I only add living people when I've been in touch with them). Eureka (I thought)!!

However, though whilst I was viewing her tree I could see this written under her user name:

Predicted relationship: Distant Cousins
Possible range: 5th - 8th cousins

when I click on her user name it states:

(her name) is not on your DNA match list
This person is either not a DNA match or has not yet taken a DNA test.

So, what on earth does that mean???