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Thank you so much! I just tried it out and was able to do the flying kick on the charge, which now seems to happen when expected.

Looking at videos of the arcade, it seems she charges at the player for longer, and more or less whenever she has the chance. You can fly kick her on the charge and knock her down, and that's the best way to beat her. That's what I did on the Spectrum version, too!
Currently that doesn't seem possible here, as she's just occasionally charging for a second or so and then breaking it off.

Thanks for checking it. She's charging in v1.5, although I haven't got past her in 1.5 yet.

Fantastic port! Really enjoyed it. Thank you!

I'm wondering if Bertha's behaviour is 100% correct as I couldn't get her to charge at me. I tried in easy mode and both 60hz/50hz. 

I used Win-UAE with 2mb/8mb.

At one point she froze, and another, she seemed to charge away from me.