Id hope she didnt "just lay" eggs being 550, even with a small 4-5 egg clutch means she was roughly 1000-1100 grams.
She I likely a mouser or a Late 2012!
I have people in shock when they see some of my 2011 girls who EAT vs my 2011 girls who just diddle and play with mice () But they all will get to size evntually so if shes a nice looking snake
Id pay between 350-400! for a 500g-800g range girl (you should be able to get her up to size for next season)!