No. Lily Collins was not in Harry Potter. Her filmography can be found in the related link. However, her cast mate on the Mortal Instruments, Jamie Campbell Bower, played a young Gellert Grindelwald.
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Harry Potter and Ginny Weasley's only daughter was named Lily Luna Potter, after Harry's deceased mother, Lily, and their good friend, Luna Lovegood.
Neither. Lily Potter was not pregnant when she died.
When Harry visited his parents graves in book seven, "Harry Potter and the Deathly Hallows" Lily Potter's birth date is written as the 30th of January 1960. Her birthday is before Harry's father James' which is on the 27th of March 1960.
Harry's mother, Lily Evans.
Ginny had one daughter with Harry named Lily Luna Potter after Harry's mum and Luna Lovegood.