
Ursula has the abilities of a dedicated clue gatherer like [Rex Murphy], so let's compare her to Rex and not Daisy and Minh.
Stats:
Ursula loses 1 fight and gains 1 escape.
Rex couldn't really use his strength without a [Fire axe] and tons of money anyway.
Now Ursula has high chances of being able to escape monsters. That's especially useful when you know that seekers have low combat abilities and that Ursula cannot splash for combat cards like [Fire Axe] or [Elusive].
Ability:
Rex's ability isn't capped, Ursula's ability is. That changes a lot of things.
In solo play, most locations will contain only one clue and Ursula's ability is better.
With 3-4 players, most locations will contain tons of clues and Ursula's ability will fall behind Rex's.
In duo, the two abilities are quite similar. Rex needs to move, investigate and succeed by 2 or more to get both clues.
Ursula needs to move, investigate successfully during her free action and then investigate successfully once more.
Rex only needs to succeed one test, Ursula has more flexibility in her actions.
Rex doesn't really need [Archaic glyphs: guiding stones] but Ursula could definitely put it to good use to investigate as fast as Rex!
Cards pool:
Rex can splash for awesome cards like [Fire Axe], [Ward of Protection], [Elusive], [Scavenging], [Lone wolf] and so on. He seems more versatile, stronger in the early campaigns & safer. With money, [fire axe] and [Higher education] he can basically succeed in every task easily. But later in the game, his card pool only improves with Seeker cards.
Ursula has access to [Armor of ardennes], [Charon's Obol: the ferryman's pay], [Grotesque statue], [Lucky dice], [The chtonian stone], [Jewel of Aureolus: gift of the homunculi] and [The gold pocket watch: stealing time]. Those are all strong late campaign cards. Those can be combined with [Dr. Elli Horowitz: assistant curator] or [Relic Hunter] to great effect. Basically she can gain xp faster and use that xp better.
She still has access to [Mind over matter], [I've got a plan], [Knife] and [Manual dexterity] to survive alone early on. Later in the game she will have access to [Strange solution: acidic ichor] and [Disc of Itzama: protective amulet]. The later also prevents Yig's revenge from stacking in the victory pile!
This may still be a bit weak for solo play, especially against bosses, but in a duo it would work wonder!
Bonus cards:
Both are useful but not broken. It's a bit sad that Ursula's card takes up an ally slot. [Dr. Milan Christopher] & [Dr. Elli Horowitz: assistant curator] are both really interesting ally choices. This may make [Charisma] a high quality option for Ursula at some point.
Malus cards: Both are back-breaking but generally won't cost you the game. Be sure to pack some horror soak for Ursula anyway.
Conclusion: In my opinion, Ursula is a really good dedicated clue gatherer. She may be even better than Rex in a multiplayer campaign or in a duo as she has a better late game potential and her ability is basically equivalent to Rex's in a duo. She is also favored in scenarios with tons of locations to explore & investigate and little to no time to do so.