In Hanafi fiqh if a girl marries without her wali’s consent her marriage is still valid, it’s a common misconception amongst desis that she needs absolute parental approval (tho it’s obviously recommended they approve). The other madhabs say it’s not allowed tho.. Also, if her wali is rejecting the guy on unIslamic grounds like colour or caste her brother or uncle or some other trustworthy relative or even the local imam can become her wali..