@CrealCritter .... were you afraid that she wouldn't have colostrum for the calf? I would not introduce any outside colostrum replacer to a calf if the cow is making milk. Different if it isn't nursing, or if she doesn't have any milk or anything.
Make sure that it is Colostrum REPLACER not supplement... the supplement is only for cows with not enough... although in your case it would be okay... but it does not have the full strength antibodies... and once you open the bag of colostrum replacer, it will not keep its full strength... due to "breaking the seal" of the bag... but you could rebag it and stick it in the freezer for any future use....
And do not overfeed the calf or it will develop scours from too much, too rich milk. You can overdue the amount fed... especially early on... But if it is nursing the cow and isn't following her around or bawling like it is hungry then do not feed it... Calves will nurse frequently and only a little at a time... especially the smaller breeds....a first calf heifer's colostrum will not be as strong in antibodies as an older cows will be... but it will provide what the calf needs because she has been exposed to "your farm's germs".....
Glad that she had it with no problem and is taking care of it as she should... that is the whole deal for a first calf heifer.... let her be the momma... the more the calf sucks, the more she will be stimulated to produce which is what nature intended...