For some reason the link works but once I am on there I cant see anything. Post some photos of her and we can go from there.
With the greyhound on her it should be an earlier one somewhere in the 50's?!?
And you are right the needles are probably the standard 15x1. You can always put one in her and turn the handwheel manually and see how it stitches. A lot of the manufactures put in there manuals or on the machine to use "their brand" of needles for best results.
Nothing but a way for suggestive selling.
Billy