Hi does anyone know if I am able to block apps on my daughters I pad i don't what her speaking to strangers

To some degree yes.

Use Restrictions on your iPhone, iPad, and iPod touch - Apple Support

Yes, you can set restrictions blocking her from adding apps. You should also block Safari and install the McGruff browser and make sure she does not use texting, iMessage, and email.

You would probably do better if you gave here a non-smartphone and don't provision it for texting.