since her parents never spoil her,I think i came up with possible reasons why Lola became a evil demon brat who is willing to resort to unscrupulous acts just to get her way and pretends to be nice so people get on her good side,and will become EVIL if she doesn't:



1.I think when she and Lana were fetuses, Rita swallowed a deadly bug that was injected with a virus that can turn People evil and mean,which came from a genetic laboratory,and it landed on Lola,and she was born evil.

or

2.Her Pageantry and Rivalry prevented her from getting along with anyone