Getting out of friendzone?

So I was shortly dating a co worker of mine for like 3 months. Then all of sudden she backed off and said she'd rather just be friends. Her excuse was due to a prior work relationship not working out. I truly don't believe this since one of her friends told me he was ok with a work relationship.

I feel like she backed off since I was playing it slow since we worked together and didn't really put in full effort as I could have. It's been months since the. and we still texted pretty often.

As of recent I've noticed a change in her responses to text and being more open about our conversations. We also hung out a few times as we went hiking and watched a baseball game together. I still have feelings for her and would like to say something and offer her to dinner. Would it be a good idea to express my feelings for her or should I not push our relationship and kinda just go with the flow and let her initiate?
Getting out of friendzone?
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