My situation was a little bit different. My T went on maternity leave and found me an interim T. They consulted with each other, I had my intake session with interim T, and then T went on maternity leave a month or so later and I started with interim T. After working with interim T (L), I found she was a better fit, so when T came back, I stayed with L. L and T do updates every once in awhile, and I write to T monthly.

Maybe your current T could consult with new T? If you trust her to. It's up to you when you want to terminate. Many Ts like going through a termination process.