You had a fair chance to know when you said "...where the last blood i found it was a pretty good amount on the side of a little tree...".
How high was it up on the tree?
Was it bright red? Dark red? Were there air bubbles in it? What kind of hair was at the shot scene? Long and brown? Were there some white hair in there? Any tallow or fat on the ground?
After the 30 yards, did you proceed further?
I'd think if you took a 35 yard shot, she's toast and you just had to look around a little more. Knocking her off her feet sounds like a solid and not grazing impact. If I were to guess, I'd say you hit her high and back.(out of the liver/lungs) High shots don't bleed out well as the blood flows into the cavity. Being hit back will result in a shot that's not as fatal... quickly.
Good luck,
iSnipe