I'm really glad that she is being allowed to compete.
So am I. When I first read the article, my thought was that legitimate safety concerns need to be dealt with first, but that this should have been addressed before she came to London and efforts should be made to reach some kind of accomodation within those boundaries, not just for her but for future years.
DF actually does martial arts, so I asked him how legitimate the concern was (I wondered because the first article said head scarves were allowed in some leagues). He said they can be dangerous, but not more so than long hair and that they need to be tucked and some techniques adapted to be worn safely. He pointed out that in the leagues where they are allowed people are likely used to those adjustments so they can be worn more safely and that it is probably an issue here because there is no way to know that everyone is aware of those changes and there is a fairness issue around expecting others to adapt their style to her. His solution was actually to have her matches in a separate room, with only women present and not to broadcast them. That way, she could take the scarf off for the match and put it back on before returing to see her next pairing.
I will be curious to see if that is what they decided to do or if they found another solution.