This.
Its definitely technique to a large degree. My 5'1" wife, who is admittedly a swimmer, so she has some upper body strength has no trouble racking any handgun I own, as long as the slide is large enough for her to grab. She prefers the overhand grip to the slingshot.
She holds the gun at chin level and punches the gun out while holding the slide largely stationary. It works for her and its fast. She's using all big muscle groups and is in a position of good leverage.
Don
p.s. I have an SR9c and we are talking about using it for her carry gun. She thinks the G19 is a bit large, the G26 a bit small. The SR9C may be just right.