contact somewhere that sells tags that you like eg SfS, Fearings etc.
They will issue a double set of RED replacement tags with her numbers on - individual number and herd number for both ears.
You might need an applicator too (?) or if you are borrowing, be sure the tags you order will fit it

If she has tears in her ears, be sure the new tags are fitted properly....
h.t.h
(if it makes no sense, tell me - my brain is cider-scattered tonight!!)