TIFU by promising my girlfriend another gift later

I've been with this wonderful woman for over two years now. She (and her family) have dropped some subtle and not-so-subtle hints about engagement. She's shown me the ring she wants. Long story short: that will very likely happen, just not right now.

For Christmas, she and I agreed on keeping a smaller budget. She wanted a Loot Crate subscription, but I missed the sales she had been texting me. I also knew that they would have an after Christmas sale; likely starting early.

At her parents' house Christmas morning, I gave her one small but very wanted gift. She made a lighthearted joke about how I usually buy more gifts, but I actually stuck to the budget this year!

I foolishly replied, in front of her family, "There's one more gift, but I have to wait to give it to you!"

After the gift giving, back in her bedroom, I checked my phone and saw her loot crate was on sale; and bought a couple extra months to make up for it.

Showing her my confirmation, I said "Sorry I made you wait, but here's the gift you really wanted!"

She immediately called her mom (two rooms away) and said "He just gave me my other present...It's the loot crate I wanted!" Then repeated "No" "No" a few times.

I finally made the connection a full hour later.

TL;DR I gave a small present to my girlfriend and implied there was a bigger present soon... In front of her family. I later bought her what she wanted, just not the ring I had mistakenly implied!