Her telling you she loves it will almost sure means she loves it so much she gives you a warning she wants it, not responding on this will likely lets her get her kick when she meets old fuckbuddies.
Friends wife loves being fucked and used hard by 2 guys.Their sexlife was at a minimum after a few years merriage, she regretted not being honest from the start and missed the being fucked while giving a blowjob so much she thought of cheating on him almost every day. When she wanted to spice things up with using toys while fucking he got exited to much and shoots to soon, making it more frustrating for both.
Years back on vacation they caught me fucking a girl i picked up from a bar when they came back in the house we rented. They started talking and while having sex he asked her if she wanted to be fucked that way, she misunderstood and said she loved to be fucked that way while sucking him. At that time it was out and they talked about sex with another guy, she was honest and told she a few times did DP and loved it. Few nights later she was in between us and while watching tv and after a few wines started to rub our legs and this started our first threesome.
So, best just ask her what she loves in a threesome and if she misses doing it. Most likely she will tell you she wants to do it.