Does anybody have that friend who gets jealous of other friends?

I have two very close friends who I am with, at least one or the other, almost all the time. Partially because I work with both. One is only a little younger than myself, and the other is a few years older and great to seek advice from. Lately, I have been spending a lot of time with the older friend without the younger. Now, if I mention anything about my older friend to the younger, she always has to comment about how we spend so much time together and she is being left out. It’s not as if we are meeting behind her back. She still lives at home and is very worried about not pissing her mom off by being out. Does anybody have this type of friend? I love the girl to death but the whole situation is getting annoying!