Yes, Shelley, you are correct, after rereading through all the source documents, the hair found on the bed was Abby's real hair. It is interesting to note that on the photo of Abby's hair switch it is listed as being found near Abby. But, no one mentions finding a braid or switch on the floor. It appears that it was entered as evidence, though why I can't figure? No mention of how the switch was applied to Abby's head, just that Abby's hair was on the short side, parted in the middle, and worn in a knot at the back of her head.

From the LBVM&L site.
I did find some pertinent hair discussion during my search, heres what I found:
Preliminary, vol 2, Dr. Dolan on the stand, pg. 145:
Q. Did these blows, or any of them, cut the hair?
A. Yes Sir, all of them cut the hair.
Q. Cut it right through?
A. Yes Sir.
Q. Was it a clean incised cut of the hair?
A. Some of it was so matted you could not tell.
There was one large one on the top that was cut as though you cut it with the shears; it was a wound that took out the piece of skull on the left side; it was not glancing, but was neat and clean.
Q. As though done with a razor?
A. Yes Sir.
I wonder if he means left side in that Abby was laying on her back and that he is actually referring to that bony mess over Abby's right ear? The only wound I've seen listed on the left of Abby's head is the scalp wound.
1. Was a glancing scalp wound two inches in length by one and 1/2 inches in width, situated 3 inches above left ear hole, cut from above downwards and did not penetrate the skull.
Then there is this:
Preliminary, vol 4, Patrick Doherty on the stand, pg. 330:
Q. In consequence of what he told you, you went up stairs?
A. He led the way, and we went up stairs, and we went into a sleeping room on the north side. We went out through the dining room, through the front hall up the stairs to a room on the north side of the house. He pointed to Mrs. Borden. I went to the foot of the bed; I looked at her. She was laying face downwards between the dressing case and the bed.
I noticed three or four blood spots on the pillow sham, and a bunch of hair on the bed.
Q. How large a bunch?
A. Well, it was a small bunch.
Q.
It was not a switch or false hair?
A.
No, I think it was human hair that had been pulled out, or something, been cut out, or something.
The questioning goes on for a bit and then there is this:
Q. How were her arms?
A. This way, something like that.
I just put one finger here, and raised this a little bit so I could see under the hair around the ear better. I called Dr. Bowen's attention to it. I told him that this woman---
Q. You had some talk with him?
A. Yes sir, I had some talk with him.
Isn't that maddening?! What was he going to say?
“Sometimes when we are generous in small, barely detectable ways it can change someone else's life forever.”-Margaret Cho comedienne