Answer:
The mother dolphin followed Kara because Kara knew where her baby calf is.
Explanation
When Kara had rescued the white dolphin calf which belongs to the mother. The dolphin was found caught in a fishing net and rescued by Kara with help from Felix, her father and the marine rescue team.
The calf was then led to a tidal pool where it was to recuperate. The mother dolphin followed Kara because Kara was taking it to where the calf was.
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