Cath shrugged off a pulled muscle to finish in 22 hours 9 minutes.
She said: "The woman who finished second did so in a time just a few minutes shy of what I did when I qualified as a Centurion at Newmarket in 2003, so I think it could have been an interesting race had I been race fit.
"It was certainly a tough experience. I had a good start but hit trouble around lap 33, which took me almost twice as long as all the others, after which apparently I developed a definite tilt to port.
"At the end of the race I was completely spent and virtually collapsed over the line.
"Many local people showed great interest as spectators.
"Sadly some of the younger elements tried to be disruptive, which doesn't give a good image of the town to visitors.
"I didn't see much of this myself, either I was too "out of it", or was recognised. I'm pleased to say that the abuse did not come from kids from my school, just for the record."