I have never been a JW but I joined this forum several years ago when a young friend started attending the local Kingdom Hall. You might be interested in her story as it relates to your situation in several ways.
My friend was 20 at the time and her study conductor had deceptively reassured her that she would NOT have to give up being a member of Girlguiding (the UK version of Girl Scouts), which I understand is in some respects similar to the club your daughters are part of.
My friend was a leader with the Brownies and whilst being 'love bombed' by the JWs, she was initially told it would be fine to continue being a Guiding volunteer provided she avoided meetings where Christmas and Easter Crafts were part of the programme and she mustn't join in with singing Happy Birthday to the girls.
Of course things started changing as she studied more and was approaching baptism. The thumb screws were tightened, but the Elders were clever, they desperately didn't want to lose their new recruit, as it was a rare prize to have a new young member who was not 'born in'.
So rather than forcing her to leave Brownies, she was strongly 'encouraged' to understand that it would be better to resign from the Brownies because it was taking her away from fully dedicating her life to Jehovah, and of course she did not want to displease Him. So believing it was her own decision, she reluctantly on principle resigned her membership of Girlguiding.
Long story short, eventually she could not cope with the controlling rules of the WT organisation, and left the JWs after much suffering and depression. She realised the WT Organisation controlled her lifestyle, her behaviour, what she could wear, which information she was allowed to read, what she did with her spare time, even what books, music and ornaments she could own, and finally they even controlled her thoughts and emotions. She had joined a high control cult-like organisation.
Having happily broken all ties with the JWs, she is now a volunteer with Girlguiding once again and gains far more from that than she ever did from her membership of the WT Organisation.
Sending you wishes for clarity of mind as you face this situation, and I hope that if you are forced to choose between the 4H group and the Watchtower, whatever you do, you will put the happiness and welfare of your daughters as your first priority. x