Wanted to say (without any spoilers) that i think this was very good and correct choice for Ronna to take on Mental Link:
1. RP and storywise - player should be feel his character and pick reasons which influenced by mechanics but by story and character personality and his/her (character's) common sense.
2. The compaign, as Numenera as setting itself is full of riddles, and very often even diplomacy game could be very riddling. Great choice on that, because some shortcuts may prevent some violence at times, or to provide subtle communication in order to win stuff.
3. Nice character flavour.
4. Could be very useful with creativity.
I endorse and encourage RP/Plot inspired choices. Wont spoler anything, but some things could be more harder than fights.
PS. Poor Nyom, eveyone attmpting to invade her mind lately :P
PPS I added Mental Link ability and ability costs to Ronna's Character Sheet