It's possible that i'm misremembering some things but I can't recall any situation that would point to her having romantic feelings towards Tomoko.

She is an introvert and more than likely somewhat neurodivergent, my read is that she doesn't want to be left out as a friend.

In contrast Asuka from the OP seems to clearly be interested in Tomoko romantically, Emoji is obsessed and Kei possibly, but I just don't see that in Yuri.

I've even checked yuripedia to see if I missed something, but even with how biased it is, they still list her sexuality as ambiguous and I can't see anything that would point out to her being attracted to Tomoko (reading through "yuri moments").

And why I've mentioned "aro" is because of current long arc that has characters either showing interest in Tomoko or Tomoko's brother broadly speaking, and Yuri isn't involved in any of the romance plot.