Unfortunately, there are no laws against filing fake molestation cases. In India, only females are allowed to file rape cases or molestation cases against men.
And has been observed that about 74% of all rape cases filed in India are fake. So sadly, you can’t do anything if she files a fake molestation case against you.
But to prove your innocence you have to collect evidence. Try to find CCTVs around that area. There may be a chance that you might get some evidence or recording to prove that you are not guilty. And on the basis of that, you can be bailed.