Personally, I don't think that starting with one friend is enough to seal the deal with an anxious child. She needs to be more able to cope within herself than relying on a buddy to be there with her.
Obviously you know more about your situation and it is ultimately up to you, but you did ask for advice from those of us who have been in a similar situation. There is a massive difference between a 4.5 year old and a 5.5 year old. You wouldn't be holding her back, just not sending her early. All research I have read has pointed towards a later school starting age being better in the long run (e.g. Terman study). This is particularly true for anxious children, they do improve over time and it isn't worth pushing them when there is no real benefit to her being at school so early.
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