all I can think of is Highway to Heaven, and I'm pretty sure it's not that you're talking about, as that wasn't really a kids programme, and it was a male angel.
My fave programmes when I was a kid -
Mr Ed.
Zoro
Black Beauty
Little House on the Prairie
Heathcliff and the Catillac cats
Inspector Gadget
The Smurfs (when I lived in France)
Button Moon
then when I was a bit older :
Grotbags
Fun House
then:
Mike and Angelo
Woof
can't remember any others I'm sure there were lots.
I realise I'm showing my age here I bet some of those older ones you lot won't remember lol