The whole thing is very odd. If the only reason she is suing Meghan is that Meghan said she was brought up as an only child then I think Samantha is on to a loser. She also doesn't seem to be suing for very much money (by American litigation standards) so if she was to refuse any settlement and take the case to court and lose she could end up with substantial costs awarded against her. I don't imagine Harry and Meghan's lawyers come cheap.
I don't know any details and there may be other allegations but the fact that the judge has said that there is a possibility some allegations could be dismissed suggests that there are others that may not be.
So it could be that:
1.Samantha is just trying to get money out of Meghan and knows that the amount she is asking for is small change to Meghan so she would be more likely to settle than let the case go trial.
2.Samantha is batshit crazy and thinks she can win and shame Meghan into the bargain.
3.Samantha is being put up to it and funded by a third party.
4.A mixture of all of the above.
There is, as other posters have said, a certain irony in the situation and I am definitely in the popcorn camp. I notice that Harry, Thomas Markle and Jason Knauf have also been mentioned as possible witnesses.
My gut feeling is that it will be dismissed before depositions but, if not, then I would love to be a fly on the wall in Montecito.