You can make a video of her pictures with friends and family, compile a video of special ones wishing her a very happy birthday or plan a zoom party and arrange for a live music session on zoom itself.
Make an instagram account dedicated to her solely. Pitch in as many friends and family members of her to send you pictures, videos or message for you best friend. Organise a zoom or a Google meet party with friends and play some games dedicated to her or about her.
Best is sent her cake, card, bouquet or celebrity birthday wish etc. at a very reasonable price from ferns and petals. They deliver fresh cake and have a variety of products and ways by which you can express your love and emotions. I myself have ordered from here for my friend and she loved it. They take proper precautions also. Plus present in every state and the best part deliver your present in the time slot which you have decided.