Tomi transferring wouldn't shock me. She was the 6th woman on last year's team, but Feuerbach transferring in complicates her role on next year's team. It's certainly possible she will average fewer minutes next year if she stays.
I also think that Tomi could be a starter at a P5 school or high mid-major. She's an athletic wing that shoots well from three. There's a reason she played a big role on a Sweet 16 team.
That said, she will be a senior and will likely have some role on next year's team, even if it might not be 6th woman. There's a high probability that she will stay and finish out her time at Iowa.