Shariah specialist

I really need your help and advice on an issue.
My fiancée is currently facing some challenges from her family. We have tried all possible methods and approaches to resolve the matter, but without success.
Her parents rejected my marriage proposal, stating that we cannot get married due to differences in ideology. She feels this is a setback for her as a Muslim, because we both believe that if a woman’s father or key family members refuse to give consent, the marriage is not valid.

When the issue started, I consulted my family members, and they all tried to call and appeal to her parents, but to no avail. Her father said he doesn’t mind even if she turns 40 before he allows her to choose who she wants to marry which sounds strange and unreasonable.

We have consulted some people, and we were advised to take the matter to a Shariah court. However, from my understanding, Shariah courts may sometimes compromise, so I’m reaching out to you for your opinion and support. If you know any trusted Shariah specialist or lawyer that you can refer me to, I would really appreciate it.

Alternatively, if you have any idea on how to approach this kind of issue, please advise. She has already contacted several of her family members including her siblings and cousins but they al intervene but her parents reject there appeal

We also don’t want to go through the customary court route, because eventually, the marriage will not be valid unless a Shariah court grants permission for the wedding to take place.