No clue why she would lie to you BUT I would certainly go directly to her and ask her outright why. Maybe she made a mistake, maybe there was a misunderstanding, or maybe she'll have a reason. No matter what...I would ask.
As far as what the others in this thread are passionately try to say, I have to regretfully agree. You and your sister may be a perfect match and it may be "oh so cute" to have the puppies between the two dogs but it's difficult to know whether or not the two dogs are a perfect match.
If both are not at LEAST 2 years old and both have not had ALL of the testing done on themselves, and their parents, and their parents parents, and BOTH are not "Show Quality" e.g. there are no disqualifying faults in color, size, etc, then it really would be a bad idea to breed them. The litter could easily end up with either more "pet quality poodles" for which there are already too many in the world or something far worse such as a genetically defective poodle which will require enormous care or worse...
Had I have read this thread several months ago I would've thought everyone was being a bit to "prissy" and way too "dramatic". I mean geezzz mutts breed with other mutts all of the time and people are taking care of healthy puppies all over the place. One would think a couple of pure breds would actually be easier to breed so what's the big deal. But I know differently now. I've seen, and am still feeling the pain, of a pure bred puppy that was not born of two perfect parents/grandparents/great grandparents. NOTHING is worth the risk of creating yet another a homeless dog or the UNCONSCIONABLE RISK of creating a puppy that will live a very short life in an enormous amount of pain. Because this situation has hit so close to home for me, never again will I look at thread like this and wonder why these people are being so picky over something that seems so "cute and simple".
Please do take the time to SERIOUSLY research the breed and examine both dogs, as well as their family, prior to considering breeding them. If they are both CERTIFIABLY excellent then possibly you would be doing the breed well by breeding them and helping to perfect the poodle population but if they are not PERFECT and you do not plan to improve their status via shows etc...then by all means spay/neauter and LOVE THEM DEAR for what they are ... your babies.