From the photo, she occupies only one seat. She holds all the shopping plastic bags on both hands.
You can only fault her for blocking the way to the other seats.
Whoever needs the seats badly can always say to the lady, "excuse me, can I go in to have a seat".
I don't see any issue with it.
What I can't stand are the young CECA couples with their self entitle mentality brings an entire pram together with the toddler inside, boarding the bus.