not able to purshase apps

Hi Rainbow-2023,

welcome to the Apple (user-to-user) Community.

Re: "My daughter's ipad is in family sharing with me, I am not able to buy apps for her .. I tried multiple options"

You might want to check she is signed in to her iPad with her Apple ID:

Sign in with your Apple ID - Apple Support

Wondering if you have set restrictions on her purchases: If you want, you could change the settings:

How to: Manage App Store purchases, subscriptions, settings, and restrictions on iPhone - Apple Support

or

Require a password for App Store and iTunes purchases - Apple Support

or

What to do: If you can’t download or update apps on your iPhone or iPad - Apple Support

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Else: If you turn on purchase sharing, everyone in your family gets access to the apps, music, films, TV shows and books that family members buy from Apple.

How to share purchases with your family - Apple Support

How to download apps and content that your family members purchased - Apple Support

Family sharing webste : Family Sharing - Apple

App Store support website : (info. / support / contact) : App Store - Official Apple Support

All the best :-)