With the passcode or passphrase for the phone itself? No there's not help for that.
But you can gain access to her Appleid account, with the correct documentation, certificates and court documents. You can contact Apple and they will tell you what is required. You can also ask them to check for legacy contact info.
And hopefully there is a recent backup on her account that you can restore from, or access on browser through iCloud etc, and preserve some photos, mementos, or other data.
All the best.