Some students looked at her with tears in their eyes.
Literal
Eye [to-に] tears [obj-を] floating her [obj-を] looked students [also-も] existed.
目に涙を浮かべて ('with tears in their eyes') is a te-form expressing manner — 'while having tears.' ~もいた ('there were also some who') uses も for an additive nuance, implying others reacted differently.