My coworker keeps taking credit for my things and I do not know if I am overreacting

I work in operations at a midsize company. There is a coworker on my team who is generally nice, but she keeps doing this thing where she repeats ideas I brought up earlier and suddenly they become “her” ideas. It is not huge stuff. For example, I suggested creating a shared tracker for vendor issues in a private chat. Two days later in a team meeting, she said, “I was thinking we should make a vendor tracker,” and everyone loved it. She did not mention that I had already suggested it. Another time I cleaned up a messy spreadsheet and sent it to her before a meeting. In the meeting she said, “I cleaned up the spreadsheet so we can all see it better.” I feel petty even typing this because these are not life-changing things. But it keeps happening, and now I feel tense whenever we collaborate. I do not want to become someone who is constantly guarding credit. I also do not want to keep swallowing it and becoming bitter.