According to the context, Ana think that she is considered to be a "aguafiestas" by her friends because she spoils the fun times.
What does the term "aguafiestas" mean?
It is a term used to refer to a person who ruins the fun or is not part of it, it can be a party, meeting or any kind of fun or rejoicing.
These people are considered bad character affecting or interrupting the moments of joy of others.
Therefore, we can conclude that according to the context, Ana think that she is considered to be a "aguafiestas" by her friends because she spoils the fun times.
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