In my county and where I live in tropical climate summer is a buggar hahaha always shrinks so just do 2 nails at a time and then the thumbs together and problem solved.
Unless you able to work very fast then do 4 nails and then the thumbs.
Flash cure usually makes my gels go wrinkly so I don't flash cure anything anymore .
But it works for some people so just play around with ideas.
Also make sure you cleanse has included wiping her nails under the free edge too. It helps