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Just to speculate a bit on the subject.
If my little experience many English speakers can't tell the difference between a stressed syllable and one with open vowels. When you tell them to plenty pronounce the vowels in unstressed syllables, all syllables become stressed. This is reinforced by English having a rhythm with tonic syllable beating time. Again, when these students plenty pronounce the vowels in unstressed syllables, all those syllables becomes sort of stressed. If she identifies which is the stressed syllable in "monotonous" /məˈnɒtənəs/ but she doesn't in "monótono" /mɔ'nɔːtɔnɔ/, maybe you just need to let her pronounce it /mə'nɔːtənə/ and wait for a better time to correct her pronunciation.
I'm not saying this is the cause; just some thoughts.
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