First thought: Take Trunda to L60.
Second thought: Take Trunda to L60.
Third thouhgt: Take Trunda to L60. Seriously, she is an awesome pull for your first Lego from a shard.
Now onto Spider advice: As you climb spider for the first time, there are a couple of tried & true tactics that may help:
(1) If you are stuck at a particualt stage, it can help to build a higher resistance "spider tank" that is negative affinity, and run the rest of the team as neutral or positive affinity. The spiderlings will all attack the negative affinity "tank", which will allow your other toons to do the work. You do need to be able to heal/revive/resist to keep your negative affinity tank alive long enough to kill Scavag (Mama Spider).
(1-A) You have Lethelin. I have never tried taunt in Spider, but I imagine you could use it just like using a negative affintiy tank since it will force the spiderlings to attack the taunt target.
(2) Stun/Burn or Freeze/Burn to let HP Burn do the work for you. As long as you can control the spiderlings with stun/freeze, HP Burn is the easiest way to climb normal spider. Lookee; Lookee. You have a Trunda. She can do both Stun & Burn. You just need to put a team around her.
Trunda is an excellent Stun/Burn/Nuke toon, and will help you in a lot of content. The other toons that you have that I would consider worth investing in for the short-term and mid-term: Apothecary, High Khatun, Morag, Mausoleum Mage & Dhukk. Unless you buy Lego Books, leave Alice alone for now. Put your Lego Books into Trunda.