IMO the more important word there is 'might'
Let's not start yet another myth, folks!!!
I don't think 'might' comes into it at all ... Jane is clear on exactly what she saw and she never deviated from that.
From Jane Tanner's statement on 4th May 2007 ...
Meanwhile a man appeared
( * ) carrying a child (**), with a hurried walk, it being this detail together with the fact that the child dressed in pyjamas, without being wrapped up in a blanket, that caught her attention. She only managed to see him from the side, with the child in his arms. She noticed the individual's presence exactly when she had just passed by Gerry and Jez who were talking, having seen this person step off the pavement that borders on the apartment block where they were staying and rapidly cross the road.
The entrance to the apartment building (1) is exactly at the place (street) where the individual appeared from.
___________________________________________________
(**) About the child whom appeared to be sleeping, she only saw her legs. The child appeared to be older than a baby. She was barefoot and was wearing what appeared to be cotton pyjamas of a light colour (possibly white or light pink). She is not certain, but has the impression a design on the pyjamas, possibly a floral pattern, but she is not certain.
As regards these details, she does not know what Madeleine was wearing at the moment of her disappearance, because she did not talk to anyone about this.
https://www.mccannpjfiles.co.uk/PJ/JANE-TANNER.htm