"She drinks too much coffee."
Translation:Вона п'є надто багато кави.
«З лишко́м» literally means 'with remainder', it can be used after an amount to say that there's actually more: e.g. три́ста з лишко́м книжо́к means 'more than 300 books' (literally, '300 with remainder books'). It can't be used in this sentence.