From an interview at Music Connection by Rob Putnam:

One of her go-to pieces in the studio is the microKORG keyboard with a built-in Mellotron emulator. “I’m addicted to the flute sound and I put it on every album,” Hatfield observes. “There’s a lot of it on Lightning Might Strike. It’s so little, easy to plug in and is transportable. Real Mellotrons are delicate, heavy and big. There’s no way I could get one in my small space but I got to use one at [Cambridge’s] Fort Apache, a studio where I used to work.”