My colleague is competitive towards and I feel the need to send a gift to my boss

I have a colleague who is 9 years older to me at work and she has been very competitive with me over the years.

The Christmas is coming and as we are working in the office, I was worried that my boss started to like her more than she likes me.

The reason why I am saying this is that we had a contest last week for best Christmas attire and she got the award even though we both dressed up.

I started to think that if I don’t give my boss an impressive Christmas present and if she did, my boss will totally be won over by her.

Is this something you could help me with?