She's been travelling to Florida every winter since 1985. In this sentence the action is her travels to Florida, which is not continuous, it happens only once in every year, in winter, from 1985 to the present time. I have been in a trouble since last week.
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Peaceblinkfriend
Since is a preposition of time that indicates the beginning point of an action. The action can be either continuous or one that has happened at one time or another within the period. <--- Hmm. I'd say "...continuous or one that keeps on happening..."She's been travelling to Florida ever