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Mary said she loves you

Mary said she is going to the party.

Note: 'She' in the above sentences refers to Mary.

Are these sentences commonly used by native speakers in conversations? I've heard people say them many times.

Thanks!
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New2grammarMary said she loves you

Mary said she is going to the party.

Note: 'She' in the above sentences refers to Mary.

Are these sentences commonly used by native speakers in conversations? I've heard people say them many times.

Thanks!
The structure of the sentences is perfectly correct and commonly used. Confusion would arise only if there had been another female recently mentioned in the conversation, to which the 'she' might refer.
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Bokeh"What are the girls doing this weekend? I don't know. What about Paula? I'm not sure about her but Mary say she is going to a party."
The same ambiguity is inherent in other languages, I guess. In Russian for sure.
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Comments  
Even with context it can be completely ambiguous. For example:
"What are the girls doing this weekend? I don't know. What about Paula? I'm not sure about her but Mary say she is going to a party."
 Ruslana's reply was promoted to an answer.
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