families vary.
in my overall family, i have a close cousin that, as an adult, decided to (simply) change her name.
she did so, but, her mother and closest family could not take that leap. there was hurt on both sides, but it did not break the family apart. decades passed. probably hurt was mitigated with time, but, awkwardness over the change did not disappear.
i do not feel either side was being obnoxious, neither should they be labeled such.
if one side is obnoxious, so is the other .. one initiated, the other was made to deal with it.
those parents have passed now. one lives with regrets.
having witnessed that, in a close+loving family, i believe both sides did their best.
i don’t believe ultimatums were given. it was just something they could not agree on.
today, ultimatums are in wide use. they are no more valuable than they ever were.
i would want to clarify the root of the ultimatum.
lots of times, people behave badly toward others. it does not have to be returned, in kind.
it’s better for it not to be.
as you are saying, this is her decision, not yours, you have not changed, nor do you expect to.
honestly, this sort of response typically leads to reconciliation - not always immediately.
it takes guts to wait it out. it can be painful, not knowing.
but, when it comes: peace. often, happiness before unknown.
learning and healing take time. allow time. it’s not something we “do” to or for others.
imho, this is a matter of faith. no faith, no patience.
this is my experience in my life. i struggle with it. “obnoxious” is not relevant, or helpful.