A question for the sisters: why does this sister act weird online (one to one) Vs irl or in group chats?
Are we associates, friends or does she fancy me.

We've known each other a couple of years through a training course we did together with and have mutual friends.

Online(private chat one to one): she is notoriously bad at communicating and will ghost if you send anything more than a few words.

Group chats: she ignores all other comments from people EXCEPT when I post in the chat, in which case she reply when I say something or after I have posted (and she will be the first to say something after I have in the group chats).

Irl - regardless of who is in the same place, including brothers and sisters we both know (she only really hangs with sisters outside of our groups and the brothers we both know are more outgoing than I, or more taller or affluent than me) she will always want to spend time with me. Her body language is a mixture of excitement, happiness and nerves and she blushes and gets a bit defensive if I playfully tease her. She is normally very analytic and super focused / serious but she will spend 10-15 mins with me and leaves the place, be it parties, get togethers etc, as soon as she speaks with me (even if food hasn't been served). She also seems disappointed if I am feeling a bit of imposter syndrome but will give constructive criticism and isn't afraid to kick my backside(metaphorically) to act more stronger/ is genuinely happy when I succeed (likewise me to her re I'm happy to be blunt if needed but supportive).

Also for some reason. She tells mutual friends (who aren't in our group chats) that I'm a very good friend and that we hang out all the time (which we do not!)

For me, I want to explore marriage with her but dunno how she feels with me. Personally I suspect she is on the fence about me and probably wants me to be a success before being in a relationship with her, but it could be me overthinking.

Also as I've mentioned. It is hard to communicate with her virtually and irl it's impossible to meet her 1:1 as well both live 2 hours (minimum) from each other (she has a very busy job and travels a lot - I won't say sector but her total comp is way higher than mine, whereas I have had busy jobs and am working on my own businesses whilst job hunting after being fired from a deputy lead role at a private health company).

Would love to hear the views of sisters about this .