She always has trouble_____(to do / doing)

doing 固定搭配:做某事有麻烦/困难

She always has trouble （in) doing, 因为in可以省略，所以后面跟doing~

意思是，做某事有困难

doing

ls 很有娱乐精神。。。
同意2楼

have trouble/ difficulty/ a hard time/ a difficult time (in) doing sth (有困难做某事)

他很难找到一份满意的工作。 He has trouble finding a satisfactory job.

have trouble with sth. (对...有困难,不好对付) I have some trouble with my English study.

用doing,不用问了。