。
She's shy and quiet.
Literal
She [topic-は] shy [and-で] quiet is.
恥ずかしがり ('a shy person') uses the ~がり suffix, which turns emotional adjectives into personality types: 怖がり (scaredy-cat), 寂しがり (someone who gets lonely easily). で connects it to the second trait: 無口 ('quiet / taciturn,' literally 'no mouth'). Two personality descriptors linked concisely.