Zevachim 68A

צריכה שתביא עוד חמש פרידין למעלה.

she must bring another 5 birds and sacrifice them all above the red line as burnt offerings. Since her commitment was not satisfied, she has not fulfilled even part of her vow. She must therefore bring two burnt offerings of each species to ensure that she fulfills her vow, and she must bring another bird to replace the initial obligatory burnt offering and fulfill her commitment to bring them together.

ממין אחד. ומשני מינין ⁠– תביא שש.

This is the halakha only if both pairs that she brought were of the same species. But if they were of two different species, and the priest does not remember which he sacrificed first as the obligatory pair, she must bring 6, two of each species to ensure that she fulfills her vow, and one more of each species to ensure that she properly replaces the original burnt offering of the obligatory pair and fulfills her commitment.

נתנתן לכהן, ואינה יודעת מה נתנה; הלך הכהן ועשה, ואינו יודע מה עשה ⁠– צריכה ארבע פרידין לנדרה, ושתים לחובתה, וחטאת אחת.

If the woman specified the species of bird for her vow but then forgot which species she specified, and she gave two pairs of birds to the priest but does not know now what species she gave, or even if she gave him one or two species of birds, and the priest went and sacrificed the birds but does not know now what he sacrificed where, in this case, she must bring 7 birds, as follows: 4 birds, two of each species, for her vow; and two more birds, one of each species, for her obligatory burnt offering, in case the priest sacrificed a sin offering of a certain species and the burnt offering must now match that species; and one sin offering of either species, in case the priest sacrificed them all as burnt offerings.