Wait till the 28/30 week mark, no doubt she'll have SPD...... yes you are right, at 18 weeks she has touched on almost every pregnancy ailment, but there's still a few to go. No doubt she's scrambling the Internet if she reads this
Can you imagine her at 30+ weeks, she will be beyond painful. Last trimester she will suffer for real though, all the shit eating and non movement WILL catch up on her, especially if she is carrying a big baby. God forgive me but it will be nothing short of what she deserves.