Heat cycles vary on all females. Having puppies does not effect when they will come in again. Some females come in every six months like clockwork and others might not come in but every 7 or 8 months or longer. It has been 6 months since your girl's last heat so it sure sounds like she is in heat.
Just a word of caution. Just because a male has been neutered does not mean he will not try to breed her. If he starts showing any interest in her then it would be very wise to keep them separated. If you are planning on having her spayed then you need to wait about 2 months after her heat cycle has ended.
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