Okay first off, damn the Succubus found you fast.
Secondly once eaten you have to start managing your stats, Rest to recover a little energy, Extended Rest to recover full energy, Brood to recover Drive, and Meditate to recover Mood. However there is a chance these actions can fail if the Pred is awake. If Mood and Drive are low that just makes things harder.
Next is to Rub Walls or Struggle- if these interactions are successful then you Technique and Vigor will rise by .1 with each respective action, up until the stat has gain a total of 1.0 per pred.
Technique will increase the odds of success for an escape attempt, and Vigor will decrease the Energy cost for the attempt- Though be aware RNG will be RNG.
Escaping a pred will require you to wait until they go to sleep, so you have plenty of time to build your stats.
Thankfully the Succubus is easy to escape from, build stats and wait for her to sleep. Others won't be as easy.