I have feelings for a good friend of mine, but despite how close we've gotten, I'm unsure how she feels about me. What should I do?

I've been friends with this girl ever since 2017 when we both met at college and quickly hit it off. We didn't see each other often, but when we did, we were on really good terms, always enjoying each other's company. Unfortunately, after I graduated, due to both my 2 failed relationships and COVID, I haven't seen or spoke to her in almost 3 years. After my semi-recent breakup back in December of 2020, I had finally reached out to her again in March, catching up with her after all that time. I was still in a rough spot mentally, as I was still recovering from my abusive ex and my grandfather's death resulting in me living on my own.

At first, she barely spoke, leaving days without actually finishing conversations, but during April, she confided to me that her mom had terminal cancer, and, as someone who's lost their parents to illnesses (ALS in my case), I kept her company over the next few months through text until her mom passed away in late June. Despite the horrific circumstances, we got closer through the pain of loss, since no one else understood what she was going through. I promised her that I'd keep talking and checking up on her even if she was struggling to reply, because she had become a recluse now that she also lives alone, and I didn't want her to suffer by herself.

It's taken time, but she's slowly getting better, and I'm proud of her. The thing is though, she's become a lot more affectionate over the past month or so, going from hugging a lot (Through text), and even receptive to light flirting (Though she didn't flirt back). She almost always likes everything I say or post on Social Media, and she makes more active efforts to talk even if the conversations don't last long.

TL;DR... I honestly think I'm in love with her, and while I'd rather her just be happy, I do want to ask her out. I just have NO idea what she think about me. So I'm a little stumped... Do I make the first move or keep going slowly like I have been? Any advice?
I have feelings for a good friend of mine, but despite how close we've gotten, I'm unsure how she feels about me. What should I do?
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