。
She makes a point of attending every meeting.
Literal
She [topic-は] any meeting [to even-にも] attend [the act-こと] [as-に] is-doing.
ことにしている ('make it a rule / habit to') combines ことにする ('decide to') with ~ている (resulting/habitual state). The result is a present-tense expression of a self-imposed habit or principle. Compare with the related ことになっている ('it has been arranged/decided that'), which is more about external rules or arrangements rather than personal resolve. 出席する ('attend, be present at') is a Sino-Japanese suru-verb taking に for the event being attended.