Alright, that's almost enough resources to kill the Gel Mother, although if you don't have any spare HP lying around Cell Block A you might wind up in trouble later in the next level.
Now that you have the grappling hook, have you been to Cell Block B 2E? In Cell Block B 1S2E and 2E you can spend 2 green keys for +6 ATK, +6 DEF, +600 HP and a skeleton key. That +6 ATK should give you enough ATK so that you can kill a gel mother with one fewer hit, so you'll take six fewer hits from the gel mother overall.
If you already have, then you'll have to either get more ATK somewhere else or get to the same point with more HP.
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