If you and the gift giver usually communicate by text, send a thank you text. If you usually communicate by email or a messenger app, send an email or DM. If you usually talk on the phone ...

I also mentioned that we never received an acknowledgment of our gift. She responded that her daughter had been busy and ...

Large gifts require the same. Other than these, a nice thank-you email or text should suffice. But ALL gifts should be acknowledged.” ...