These exclusive pictures were taken on November 12, 1985 in the dining room of the Rebbe's house in Crown Heights. Note that she did not cover a large portion of her hair.
This is her American naturalization picture taken in the early 1940s:
Here's another picture of her taken while she was allegedly standing on a balcony watching a Lag Ba'omer parade in Crown Heights:
Update 5:12 pm CST – I added another picture from the same source at the top opf the post and immediately below. As you can see, it clearly shows that it is her real hair and not a wig: