She's showing her adult colors with the mustardy brownish splotches....she is likely producing eggs now...so be careful not to overfeed her or keep her too warm so she won't develop reproductive issues and die.
She needs a egglaying bin in her cage at all times now too. Female veileds can produce eggs without having a mate...so you need to be prepared.
How many insects do you feed her in a week?
What are your basking temperatures?