Engagement Ring

..so my dad’s ex wife has my (passed) grandmothers engagement ring, pears she wore to her wedding, and a ruby ring. she and my dad had a baby together, however she does not see us anymore. it has been about 7 years. however, i would really love to have my grandmothers ring when i get engaged (my bf and i have been together for 3 years so it’s close) i don’t know how to ask her, if i should see her in person first or ask through a text...