Any more specific clues for a egg laying date?

[Ryan Pye]

My girl has already did a "30" day shed on Feb 18 (the guy that had her last year said she didn't lay until a month and a half after) and been lying belly up to heat almost 40%-50% of the time. Is there any more clues that might give away when she's getting ready to lay, maybe some behaviours that pythons display more closely to the time?

Any help or experiences would be appreciated,

Ryan