Try these ancient components model for you and your mom. You don't need to post the results here.
If that CHG is not contained within Yamnaya, then maybe there is something interesting that happened.
I know for example that my father scores more Caucasus-related ancestry than the rest of us, but his is contained within the steppe component.
Hence, it is unlikely that it was mediated via a source from Caucasus. Maybe that's the same in your case.
Code:
Anatolia_Barcin_N,0.1175998,0.180118,0.0035312,-0.101158,0.0510443,-0.0483875,-0.0043582,-0.0069334,0.0362287,0.0807473,0.0079718,0.0118803,-0.0234545,0.0004691,-0.0419807,-0.0101913,0.0233091,0.0019866,0.0136954,-0.0097489,-0.0142249,0.0057723,-0.0041232,-0.0031658,-0.0043437
GEO_CHG,0.091058,0.102568,-0.083344,-0.00323,-0.08617,0.020638,0.024911,-0.001846,-0.128236,-0.074717,-0.006333,0.023979,-0.054856,0.004404,0.026601,-0.03275,0.02386,-0.013429,-0.022249,0.034767,0.033815,-0.007048,0.006532,-0.025787,-0.002036
WHG,0.1246365,0.116278,0.184789,0.189279,0.1546445,0.0464355,0.0131605,0.0372675,0.0890705,0.017768,-0.0153455,-0.015811,0.0159065,-0.0030275,0.053338,0.0582065,0.00502,0.016343,-0.0093015,0.055589,0.0944585,0.0111905,-0.049607,-0.160866,0.0170045
Baltic_LVA_HG,0.1292603,0.1004104,0.1802636,0.1972329,0.1064236,0.0560919,0.0083574,0.0207106,0.0524476,-0.0261394,-0.0046788,-0.0181151,0.0281434,-0.0053759,0.0355759,0.0480141,0.003072,0.0040856,-0.0059236,0.042325,0.0613526,0.0130531,-0.0262979,-0.1110549,0.0095949
IRN_Ganj_Dareh_N,0.0430252,0.0664158,-0.1550722,0.0047158,-0.122669,0.0235384,0.017109,-0.0011998,-0.082546,-0.0544158,-0.0028258,-0.0016186,0.0044896,-0.0062756,0.0316498,0.0561384,-0.0054242,0.0068664,0.0136508,-0.0334162,0.00856,-0.028836,-0.0110678,-0.039331,0.0222254
Levant_Natufian,0.020488,0.1431895,-0.0377125,-0.1387295,0.030775,-0.079484,-0.025616,-0.0175375,0.114329,0.002005,0.0332085,-0.0222555,0.076486,0.002133,0.0153365,0.009016,-0.0154505,-0.001014,-0.02206,0.040832,0.001497,0.0001235,-0.003636,-0.0044585,0.006287
Nganassan,0.0476917,-0.4066181,0.1557885,0.0023902,-0.1594452,-0.0882129,0.0285066,0.0433367,0.0310876,0.0128477,0.1028569,0.0094115,-0.0040734,-0.0261619,-0.0219731,-0.0123307,-0.0010952,0.0134165,0.0268365,-0.0008505,0.0431363,-0.0118954,0.0336096,0.0003977,0.0135556
West_African:Yoruba,-0.6300625,0.0625011,0.022113,0.0167079,0.0005035,0.0124741,-0.044417,0.0477673,-0.0488813,0.0327694,0.0046205,0.0007904,0.0230561,0.0009509,0.0125232,-0.0096067,0.0070763,0.0004491,0.006022,-0.00299,0.0015542,0.0023156,-0.0017592,-0.0004711,-0.0004246
Indian:IND_Great_Andamanese_100BP,-0.018212,-0.235603,-0.128598,0.098838,0.023389,-0.003904,-0.016686,-0.003231,0.059721,0.02041,0.023222,0.004646,-0.0055,0.001239,-0.016151,-0.008884,0.009518,0.001014,-0.004902,0.026888,-0.00549,0.011994,-0.013311,-0.001205,0.000958
Yamnaya_UKR,0.1160995,0.0878435,0.0465745,0.106106,-0.030467,0.038766,0.0074025,-0.0026535,-0.0502105,-0.070252,-0.002923,0.003297,-0.002453,-0.019198,0.0311475,0.013988,-0.0009775,-0.0118455,-0.0036455,0.001313,-0.001248,-0.001175,-0.003636,0.0211475,0.001856
IberomaurusianMAR_Taforalt,-0.189857,0.0814452,-0.0242866,-0.085595,0.027636,-0.0552202,-0.0705968,0.0184146,0.155397,0.003499,0.0209156,-0.0318316,0.0747168,-0.0513334,0.0711988,-0.0363032,0.0052676,-0.066106,-0.1424162,0.0389938,-0.0376836,-0.1255322,0.0730118,-0.0137606,0.0164534
RUS_Devils_Gate_Cave_N,0.0227646,-0.4480516,0.0728598,-0.052972,-0.0414846,-0.0407738,0.005264,0.011215,0.0075266,0.021431,-0.0507624,-0.005665,0.0027948,0.0100466,-0.0100162,-0.0120658,-0.0043026,0.0060558,0.0153102,0.0099798,0.0104566,-0.0287366,-0.0196458,-0.0016628,-0.0099152
Try these ancient components model for you and your mom. You don't need to post the results here.