As I explained previously you do not know if it was pre-lay, if your snake was building up which means developing follicles it does not mean she ovulated (egg fertilization) nor that she will ovulate especially since there is no male involved and that parthenogenesis is highly unlikely.
Female will build up (developing follicles) however if not bred they just simply absorbed their follicles (some rare cases of ova being expelled have also been documented)
Follicular development is something that last 4 to 8 months and during that time females will shed, those are not pre-lay shed, a pre-lay shed is something happening withing 14 days of ovulation and an ovulation is hard to miss and very different than just building up, the animal is VERY swollen in the mid section and hard nothing like the picture you posted.
Worst case if you missed the ovulation (again unlikely without a male) and the animal had a pre-lay shed your eggs would be laid 30 days after the pre-lay (on average)
I will say it again drop your vet he has NO CLUE.