Aww! Check her for diaper rash or other urinary or yeast complication, and of course, make sure the temperature is ok, not too hot. Sometimes even when rash is not present, the stinging from a previous bath is remembered, and she may need just a lot of coaxing. Omit bubble bath as a general rule, and when you wash her hair, get her out of the bathtub shortly after rinsing. Until you rule out diaper rash or any genital irritation, I'd avoid any bath products like bubbles, colorants, etc.
Also bathtime is no longer than 15 minutes!
The image of daughter standing and crying in the bath plucks my heartstrings; my daughter has done that too. Good luck to you mama!